Six in 10 of registered voters doubt Sarah Palin's qualifications to be President and fewer than half believe she has a grasp of complex issues, according to a Washington Post/ABC News poll conducted Sept. 27-29. ABC's analysis of the results said: "In advance of her debate against Joe Biden tonight, Palin now looks like more of a drag than a boost to the GOP ticket."

The Post/ABC poll reflects similar findings in other national polls, like one published yesterday by the Pew Research Center and the Associated Press-GfK, as well as battleground state surveys by Public Policy Polling and Quinnipiac University.

The number of voters who said that John McCain's choice of Palin made it less likely they would vote for him rose from 19 percent on Sept. 4 to 32 percent in the Post/ABC survey. Twenty-three percent said they are more likely to vote for McCain because she is on the ticket, about the same number as in early September, and 45 percent said it would make no difference.