Enemy number one used to be her Chief of Staff, but he's written an editorial claiming Bachmann is "so not ready for presidency":

Having seen the two of them, up close and over a long period of time, it is clear to me that while Tim Pawlenty possesses the judgment, the demeanor, and the readiness to serve as president, Michele Bachmann decidedly does not.

The Bachmann campaign and congressional offices I inherited were wildly out of control. Stacks upon stacks of unopened contributions filled the campaign office while thousands of communications from citizens waited for an answer. If she is unable, or unwilling, to handle the basic duties of a campaign or congressional office, how could she possibly manage the magnitude of the presidency?

Enemy number two is Tom Petty, who asked Bachmann to stop playing "American Girl" at her campaign events.