WASHINGTON — Since its Islamist revolution of 1979, Iran's hardline leadership has relentlessly painted America as a racist, bloodthirsty power bent on oppressing Muslims worldwide.

Nothing punctures this narrative more than the election of an African-American, Barack Obama, who supports dialogue with Iran and whose middle name — Hussein — is that of the central figure in Shiite Islam.

While the Bush administration's policies often served to unite Iran's disparate political landscape against a common threat, an Obama presidency could accentuate the country's deep internal divisions.