Americans are more polarized in their views of President Barack Obama than they've been on any other first-year president, according to a new Gallup poll.

There is a 65 percent gap between Democrats' and Republicans' average approval ratings for Obama this year. That compares to 52 percent for Bill Clinton, and 45 percent for George W. Bush.

Bush saw a huge approval bump among both Democrats and Republicans after 9/11, a boost which steadily declined over the rest of his tenure.

Obama's polarization is likely due to his strong backing of controversial legislation like the stimulus package and healthcare reform, but it nevertheless contradicts his campaign argument that he would help unify the country.