WASHINGTON – President Barack Obama holds a lead of 2 percentage points over Republican challenger Mitt Romney in Reuters/Ipsos poll results released on Saturday.Obama led Romney by 47 percent to 45% among likely voters, a slim margin within the daily national online tracking survey’s credibility interval.The poll also found that 88% of registered voters now say they will definitely vote for their candidate, leaving just 12% who say they could change their minds, 10 days before Election Day on November 6. An average of about 15% said they could switch contenders in Reuters/Ipsos polling last week.Nearly one in five – 18% – said they had already cast their ballots. Among those, Obama led 55% to 41% for Romney.That result is not considered predictive because more Democrats vote early than Republicans.The survey was conducted October 23-27. It sampled 1,665 registered voters and 1,291 likely voters.The precision of Reuters/Ipsos online polls is measured using a credibility interval. For this survey, the credibility interval is plus or minus 2.7% for registered voters and 3.1% for likely voters.