But within weeks, staff and senior leadership were abandoning the campaign and key supporters were complaining about its disarray. Bachmann went on to finish a distant sixth-place in the January 2012 caucuses and quit the race the next day.
Sorenson left the Bachmann campaign less than a week before the caucuses and endorsed Ron Paul's presidential bid.
Bachmann also is being investigated by the U.S. House's Office of Congressional Ethics in light of Waldron's complaint. And Bachmann's campaign and Sorenson also are being sued by a former staffer who claims Sorenson stole a private email.
An attorney for Bachmann did not return a call or email message seeking comment.
Associated Press reporter Thomas Beaumont contributed to this report.