John McCain has been more successful in courting Republican voters who previously backed one of his GOP primary rivals (88% now support McCain) than Barack Obama has been in gaining support from former Hillary Clinton voters (72% now support Obama). Obama is attracting more Clinton supporters than earlier in the campaign (59% in May), but 18% of former Clinton supporters now say they will vote for McCain, 3% will vote for someone else and 7% are undecided. Read More

Russell Heimlich  is a former web developer at Pew Research Center.