Eighty-six percent of voters who say they voted for Barack Obama in 2008 are backing Obama again this year, a smaller proportion than the 92% of 2008 John McCain voters who are supporting 2012 Republican candidate Mitt Romney. Nine percent of 2008 Obama voters have switched to supporting Romney this year, while 5% of McCain voters have switched to Obama.

The results are based on July 23-29 Gallup Daily tracking with more than 2,000 registered voters who reported voting in the 2008 election. Of these, 48% said they voted for Obama and 42% McCain, with the remaining 10% saying they voted for another candidate or not disclosing their vote choice. However, the six-percentage-point advantage in reported voting for Obama is similar to the actual seven-point edge he had over McCain in the final 2008 returns, 53% to 46%.