A new Rasmussen poll of Pennsylvania gives Barack Obama a narrow lead over John McCain in this must-win state. The numbers: Obama 46%, McCain 42%, with a ±3% margin of error.

And despite the constant message in the primaries that Obama wouldn't be able to win "beer track" voters, the pollster's analysis has this: "Obama has a sizable lead among those voters earning less than $40,000 a year, with McCain well ahead among those who earn more than that annually."

Even if we factor out African-American voters who are more economically downscale, this would still suggest Obama is doing solidly among white blue-collar voters.