Barack ObamaBarack Hussein ObamaSaagar Enjeti rips Buttigieg for praising Obama after misquote Steyer scores endorsement from key New Hampshire activist Saagar Enjeti dismisses Warren, Klobuchar claims of sexism MORE has reached his highest level of support in Gallup's tracking poll.

Obama leads John McCainJohn Sidney McCainSteve Schmidt: 'Overwhelming chance that Trump will dump Pence' for Haley Lindsey Graham basks in the impeachment spotlight Sanders proposes expanded Veterans Affairs services, B to rebuild infrastructure MORE 50 percent to 42 percent according to Gallup's Tuesday survey, which takes into account responses from Saturday through Monday. The two candidates had been virtually tied in the polls at the start of the Democratic convention last week.

In Rasmussen's tracking poll, Obama leads McCain 48 percent to 43 percent. When "leaners" are included, Obama leads 50 percent to 45 percent. Obama has increased his support among Democrats, 85 percent of whom now support him.