It's Tuesday, November 4th, 2008, Election Day in America. The last polls have straggled in, and show little sign of mercy for John McCain. Barack Obama appears poised for a decisive electoral victory.
Our model projects that Obama will win all states won by John Kerry in 2004, in addition to Iowa, New Mexico, Colorado, Ohio, Virginia, Nevada, Florida and North Carolina, while narrowly losing Missouri and Indiana. These states total 353 electoral votes. Our official projection, which looks at these outcomes probabilistically -- for instance, assigns North Carolina's 15 electoral votes to Obama 59 percent of the time -- comes up with an incrementally more conservative projection of 348.6 electoral votes.
We also project Obama to win the popular vote by 6.1 points; his lead is slightly larger than that in the polls now, but our model accounts for the fact that candidates with large leads in the polls typically underperform their numbers by a small margin on Election Day.
This race appears to have stabilized as of about the time of the second debate in Nashville, Tennessee on October 8th. Since that time, Obama has maintained a national lead of between 6 and 8 points, with little discernible momentum for either candidate. Just as noteworthy is the fact that the number of undecided voters is now very small, representing not much more than 2-3 percent of the electorate. Undecided voters who committed over the past several weeks appear to have broken roughly equally between the two candidates.
Our model forecasts a small third-party vote of between 1 and 2 points total; it is not likely to be a decisive factor in this election except perhaps in Montana, where Ron Paul is on the ballot and may garner 4-5 percent of the vote.
