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Number crunchers were right about Obama despite what pundits said

Statisticians like Nate Silver looked at all polls and concluded President Obama would win. They may change how races are predicted — and conducted.

November 08, 2012|By Ken Bensinger, Los Angeles Times
  • Nate Silver correctly called all 50 states in the electoral college.
Nate Silver correctly called all 50 states in the electoral college. (Penguin Press )

President Obama triumphed on Tuesday. But the biggest winner may have been math.

After decades of relying on predictions from political pundits and wildly gyrating polls, Americans saw a small band of number crunchers redefine the business of election forecasting. Armed with computer simulations and confidence in cold hard data, these self-described geeks called the presidential race and a slew of smaller contests with stunning accuracy.

Their foresight proved astonishing and provided the political class endless talking points to debate in the weeks leadng up to election day. In the process, these statisticians may have fundamentally changed the way that political campaigns are watched and conducted in America. Think of it as Moneyball, which revolutionized baseball, applied to the most important pennant race of all.

The captain of the math brigade, Nate Silver, a former baseball statistician turned New York Times blogger, correctly called 50 of 50 states in the electoral college, assuming Florida remains blue. Sam Wang, a Princeton University neuroscientist who moonlights as an election forecaster, accurately predicted that Obama would capture 51.1% of all votes cast nationwide. Drew Linzer, a political science professor at Emory University, five months ago predicted that Obama would win 332 electoral votes, which will hold up if Florida goes to Obama.

All told, about a dozen math wizards entered the political fray this campaign cycle, championing statistical methods and advanced computing power over partisan bias and conventional wisdom.

"The principle behind this movement is that numbers aren't ideology," said Scott Elliott, a computer engineer in North Carolina who operates the site

A deeply religious Christian conservative, Elliott voted for Mitt Romney. But his computer model predicted months ago that Obama would easily win the electoral college. Elliott correctly called every state except Florida.

"The poll data don't come in wearing a blue shirt or a red shirt," he said. "They are what they are."

Like other quants in the blossoming field of election probability, Elliott depends heavily on data from the many hundreds of state and national polls taken throughout the course of the election. In simple terms, these forecasters aggregate data, average them and then use high-powered processors to run tens of thousands of simulated elections. Then they base their predictions on the most frequent outcomes of those simulations.

Each poll, conducted by groups including Gallup, Public Policy Polling and Rasmussen, might have a margin of error of 5 or more percentage points. By combining all of them, that error margin diminishes to near-invisibility, said Wang, the neuroscience professor. His simulations not only predicted Obama winning the electoral college handily, but they also nailed upsets like Heidi Heitkamp's winning a Senate seat in North Dakota.

It is a method predicated on the belief that the more data on hand, the more accurately outcomes can be predicted. Yet Wang and others of his ilk were roundly attacked before the election for allegedly slanting the results to match their political preferences.

"At the national level, pundits were taking brickbats at us because they felt we were in the tank for Obama, but in reality, we were in the tank for getting it right," Wang said.

Nobody caught more flak than Silver, whose FiveThirtyEight blog (named for the total number of electoral votes) became the online phenomenon of the year. Churning out new predictions and deep-dive analyses of polling methodologies on nearly a daily basis, his blog was followed religiously by political junkies.

Silver picked Obama to win from the start. Over the campaign's final weekend, he put the president's chances above 90%. That evoked yips of joy from Democrats, but furious cries from conservative commentators including Dick Morris who called Silver's work skewed and predicted a "reckoning" after the election. Silver was even taken to task by his own newspaper. The New York Times public editor criticized him last month for sparring with MSNBC host Joe Scarborough. Silver challenged Scarborough to a $1,000 bet that Obama would win, after the TV personality called him an ideologue and a joke.

Scarborough didn't take that bet. Perhaps he knew better than to challenge Silver, who stunned the baseball world in 2008 by accurately predicting that the last-place Tampa Bay Rays would turn it around and become one of the best teams in the American League. In fact, they went on to make the World Series.

"This probably does rebuke the pundits," said Dean Chambers, a conservative who also tried his hand at computer-aided poll analysis this year. "Nate Silver was right on the mark."

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