The McCain Bubble?

New Pew poll shows what everyone already knows — John McCain is slipping a lot. But they also have interesting demographic breakdowns. People normally think of Democrats as always winning big among African-American voters, so there’s been relatively little attention paid to the fact that Obama is doing better than usual among blacks, improving performance enough to probably get a 1 percentage point boost overall versus what Kerry was doing. And he’s solid with Latinos as well. But here’s white voters only:

As you can see, what’s keeping McCain in the game here are huge margins among his fellow white senior citizens. That raises, in my view, the question of whether McCain isn’t primed for a catastrophic drop in support once people start attacking his social security position.