A new Pew Research survey finds President Obama now leads Mitt Romney nationally by eight points among likely voters, 51% to 43%.
“Not only does Obama enjoy a substantial lead in the horserace, he tops Romney on a number of key dimensions. His support is stronger than his rival’s, and is positive rather than negative. Mitt Romney’s backers are more ardent than they were pre-convention, but are still not as enthusiastic as Obama’s. Roughly half of Romney’s supporters say they are voting against Obama rather than for the Republican nominee.”