About one in 11 citizens who voted for President Obama in 2008 say they will support presumptive Republican presidential nominee Mitt Romney this year, according to a Gallup poll released Monday.

According to the poll, 86 percent of 2008 Obama voters plan to vote for his re-election this fall, while 9 percent will vote for Mr. Romney and 5 percent are undecided.

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Of voters who supported 2008 GOP nominee Sen. John McCain, 92 percent said they will vote for Mr. Romney while 5 percent will support Mr. Obama and 3 percent are undecided.

Pollsters said the results show that support has shifted somewhat away from Mr. Obama since he won the 2008 election by seven points, but that he still has enough support to be competitive in this year’s race.

They also said the shift away from Mr. Obama isn’t especially large, but that it represents a swath of conflicted voters who could be up for grabs between now and Election Day.