It remains far too early to predict what will happen November but the post-convention polls give clue as to how Sarah Palin might affect the race. Either candidate can certainly still win, but my suspicion is that the major effect of choosing Sarah Palin will be to change the outcome from an Obama landslide to a narrow victory. Choosing a polarizing candidate such as Palin has been called a gamble for McCain. The real effect might be to help keep him from being blown out as opposed to helping him win.
McCain has certainly had an impressive bounce, and he managed to limit Obama’s by wisely springing his announcement the day after the Democratic convention concluded. The problem for McCain is that this might have converted an election which was primarily a fight for the center to a replay of the old Karl Rove campaigns aimed at the bases. The problem for McCain is that the Republican base is much smaller than it was in 2000 and 2004. Palin will help McCain avoid a landslide loss by preventing the religious right from staying home as they otherwise might have, but will hurt McCain among the independents, especially as the country gets a closer look at Palin.
McCain looks good in the national polls, at least for the moment, but we know the election is really won in the electoral college. It doesn’t do McCain much good to expand his lead in conservative states which are excited about Palin if he cannot convert this into victory in the battleground states. The Fox/Rasmussen Swing State polls show reason for hope that Obama would still win in the electoral college, especially if McCain is now near the top of his post-conventon bounce. Nat Silver summarizes these polls, along with PPP‘s new poll of Michigan and SurveyUSA‘s new poll from Virginia:
At a macro level, these numbers seem like basically good news for Obama, since the overall numbers in swing states haven’t moved much at all – just shifted around some from region to region. McCain is polling about 3 points better right now than he was at the pre-convention equilibrium. It’s possible that those 3 points are manifesting themselves mostly in states that were already very red. Maybe Obama will lose Idaho and Nebraska and Alabama by 30 points rather than 20, but that doesn’t help McCain very much electorally (an exception might be in a state like Indiana).
In other words, I suspect that the probability of Obama winning the electoral college while losing the popular vote probably increased as a result of the post-convention dynamics. If you literally just looked at the polling out today, McCain would win the popular vote by 2-3 points, but Obama would probably be at least even money in the electoral college, by just barely holding onto Michigan and Pennsylvania and then either winning the Colorado/Iowa/New Mexico parlay, or perhaps Florida.
TPM Election Central reviews several swing state polls:
• In Colorado, Obama leads by a 49%-46% margin, actually an improvement for him since McCain’s 49%-48% edge three weeks ago. Both results are within the margin of error.
• In Florida, the race is tied 48%-48%, compared to a 48%-46% McCain edge from about three weeks ago.
• In Ohio, McCain leads 51%-44%, compared to a 48%-43% lead for McCain from almost three weeks ago. Rasmussen has been the most favorable pollster for McCain in Ohio.
• In Pennsylvania, Obama has a slim 47%-45% edge, not significantly different from his 48%-45% lead two and a half weeks ago.
• In Virginia, McCain has a 49%-47% lead, not significantly changed from a 48%-47% McCain lead from over three weeks ago…
Separately, a new SurveyUSA poll of Virginia conducted this past Friday gives McCain an identical 49%-47% lead, with a ±3.7% margin of error. This is also not significantly changed from a 48%-47% McCain edge from over three weeks ago.
These state polls show that the increase in McCain’s national lead since the convention does not tell us very much about the real state of the presidential race.