New Mexico in Presidential politics

In this installment of the state-by-state series, I examine the newest Mexico there is, New Mexico. A relatively small state with relatively large swings in its margin of victory, to the intelligent human eye it seems to be somewhat unpredictable, with perhaps a chance of being a bit more democratic than the nation as a whole.

Democrats did better in New Mexico than in the nation as a whole in 5 of the last 7 presidential elections, and when they did worse, it was only by 1-2%. By contrast, when democrats did better in New Mexico than they did in the nation as a whole, they've lately been doing 6-10% better. This adds up to a prediction that democrats will do better in New Mexico than the nation as a whole by about 7.1% (based on my simple linear fit model). This is a close one, but I'm going to color it blue in our little map:

The Democrats seem to be doing well. However, keep in mind that in this map, blue and red are more like the projections of which party would win that state if the overall popular vote was at or near a tie. If one party has a large 4% advantage over the other, then a state like New Mexico, Nevada, Virginia, or North Carolina may well flip.

New Hampshire in presidential politics

Measurements of smaller populations should have larger uncertainty and error bars - and this is exactly what we see in New Hampshire, the smallest state to be covered so far on this blog series. Aside from a spectacular win by George H. W. Bush in 1988, New Hampshire has fluttered back and forth from republican-leaning in 1992 to democratic-leaning in 1996, back to the right in 2000, and finally back to the left for the following 3 elections since. I'll interpret this to mean that the Dukakis campaign probably abandoned all hope of winning there, and focused instead on other states. Subsequent campaigns probably focused more on New Hampshire, bringing it closer to the center.

We can see the somewhat ridiculous prediction by my naive linear model: an 8.9% advantage by the democrat, with rather large 4.6% error bars. Any real person looking at this data would predict that it'll probably be much closer, with perhaps a small democratic advantage (neglecting 1988 from my linear fit model - without any objective basis - gives a prediction of a smaller democratic advantage of 0.8-5.4%). My model could benefit from some way of weighting recent elections more heavily than long-ago elections. Maybe next time.

Coming up sometime soon (maybe) by popular demand: including the midterm election data in my prediction and analysis!

Arizona in Presidential Politics

Good old Arizona. I've seen a fair bit of interest on the left in a demographic advantage that Democrats my someday gain in Arizona (and other states, mostly in the South). So when I analyzed Arizona's margins in the last 7 elections, I was expecting to find some interesting wiggles and bounces. I was disappointed.

Aside from a small bounce for Republicans in 2008 (caused by hometown hero John McCain at the top of the ticket), Arizona has had little movement over the past 7 elections. In constructing my simple linear model, I excluded the 2008 data, and got a prediction that in 2016, Arizona will vote about 10% more republican than the nation as a whole. As it always has.

Blatantly screen-grabbing another website that lets me easily make my own little predicted map of the 2016 election, here's what we've got so far:

In this map I've shaded the states red or blue based on my guess as to whether or not a given party has a large advantage in that state. In other words, democrats won't necessarily win Pennsylvania, but if they've lost Pennsylvania, it will be because they've done very poorly in the national popular vote. As I visit each state on this blog, I'll fill in more states on this map, or leave them blank if they're true toss-up states. But as of right now, Democrats seem to be sitting pretty.

Astute readers will note that I have declared certain states without presenting a detailed analysis. For some of those states, I'll visit them in forthcoming posts. For others, I'll just let the history speak for itself (and if you want to gamble that Wyoming breaks blue, I'll take that bet).

Missouri: A Bellwether state from yesteryear

Until 2008, Missouri had the longest unbroken streak of electing the presidential candidate who ended up winning the presidency (although not always the popular vote). But during the last two cycles, Missouri abandoned its bellwether status, breaking toward the republicans even when Barack Obama won the national popular vote by more than seven points.

Starting in 1996, Missouri started drifting to the right of the nation as a whole, culminating in a 10% romp for Romney in 2012 while the nation voted for Obama by 4%. Based on my simple linear model, Missouri is almost certain to break for Republicans by a large margin.

Nevada in presidential politics

The next stop for our tour of possible swing states is Nevada.

We can see a pretty clear case of a state that has shifted somewhat from flirting with the republican party to flirting with the democratic party. Based on my extremely simple model, if this trend continues, Nevada has an 84% chance of voting at least 4.8% more democratic than the nation as a whole.

What might be causing this slow-and-steady shift to the left for Nevada? Perhaps an influx of minorities and young workers.

Kansas in Presidential Politics

Just a quick post that looks like all the others. Here I focus on Kansas, and how it has shifted from 5% more republican than the rest of the country, to reliably 25%+ more republican than the U.S. as a whole.

In contrast to the previous two states I've analyzed, Kansas clearly and definitively departed the "swing state" zone a long time ago. It's probable that neither party bothered to mount much of a campaign, causing Kansas to quickly shift to some kind of "natural state", the way it votes for president when it isn't a focus for both campaigns. And for Kansas, that natural state seems to be solid red.

Pennsylvania in presidential politics

This is the next post in our series, "How are the swing states doing anyway?" Next up, we have Pennsylvania, which has been consistently just a little more democratic than the nation as a whole:

It has jumped around a little bit, so it's hard to discern any real trend other than "probably steady". Quantitatively this translates into our 2016 prediction: Pennsylvania will probably be around 2.6% more democratic than the rest of the nation (68% chance for a democratic advantage between 1.15-4.05%, with large assumptions including a straight-line fit through the historic dem advantage).

Without a clear trend, I won't even try to come up with any kind of guess about what demographic, political, or economic events could have been causing these observed numbers.

Once I complete this kind of analysis for all of the swingier states, I'll be able to construct a model predicting which states are likely to be the tipping point states, and what kind of national vote totals will translate into an electoral college win on either side.

Virginia in presidential politics

I love projecting presidential elections way too early, so obviously it's time to start predicting for the 2016 Big Game!

Today, I wanted to talk specifically about Virginia. Until recently, Virginia has been considered "safely" Republican during the presidential election - even if you count 2008, when Barack Obama won the state. What do I mean?

Let's go back to 2008, when Barack Obama won Virginia by a 6.3% margin, while winning the US popular vote as a whole by 7.3%. Now let's say we adjust our magical "popular vote" dial, reducing the democrat's share of the popular vote equally among all the states. The first state to flip to the republicans would be North Carolina. Then Indiana, Florida, Ohio, and then Virginia, at which point John McCain would still have been 11 electoral votes shy of winning. On top of all those states, he would also have needed to flip Colorado and finally Iowa, which would have been unlikely if he hadn't ALREADY won Virginia. So, for Obama, Virginia was unnecessary to his win, and for McCain, winning Virginia would be a given if he had carried Colorado and Iowa, which would have been required to win the election. Let's use Nate Silver's terminology and designate Iowa the "Tipping Point State" for 2008. Under that model, either candidate just has to win Iowa and all the states on their side of Iowa, assuming each state has a reasonably similar per-capita elasticity (voter response to campaign activity) and each campaign has pretty good knowledge of current polling in each state. How will each state change with respect to the national average? Let's zoom in on Virginia:

In the graph above I've plotted Virginia's Democratic (2-party share) vote margin for the past seven presidential elections. Although the national and statewide margins bounce around chaotically, by looking at the difference ("how republican Virginia is compared to the nation as a whole"), we can see that Virginia has slowly but clearly been drifting away from Republicans since 1988, culminating (so far) in the 2012 election, when it had essentially the same vote margin as the nation as a whole. Based on a simple linear fit, I predict that in 2016, the democrat will get a higher margin in Virginia than nationwide, by about 2%, for the first time since FDR. That means that even if the Republican gets 51.00% of the national popular vote, they'd still lose Virginia.

[Update: the error bars show +/- one standard deviation from the linear model. In other words, if all my assumptions are true, there is a 68% chance that Virginia in 2016 will fall between the two error bars, and be somewhere between 0.8% and 3.3% more democratic than the country as a whole.]

I'm sure there are numerous expensive demographic studies out there detailing exactly why Virginia is drifting from right to center ... so does anyone want to trudge through them for me? My guesses at the moment:
1) growth in the DC suburbs and exburbs,
2) more generally, increasing urbanization throughout the state, and
3) a growing young and minority population, which is disproportionately happening in Virginia.

I hope to complete a similar analysis for all of the so-called "battleground" states, and calculate a prediction of the systematic advantage the democrat or republican has going into the election. I'd be so excited if the democrat won the electoral college but lost the popular vote; then we might finally see some bipartisan reform to the current broken electoral college system!