Like Newt Gingrich before her, GOP presidential hopeful Michelle Bachmann has lost two of her most senior aides.

Ed Rollins, Bachmann's campaign manager, said he cannot work rigorous 14-hour days every day of the week for the Minnesota Republican. His deputy, David Polyansky, will also be stepping down.

After suffering a stroke 18 months ago, Rollins, 68, attributed health reasons as the primary reason for his departure, The Daily Mail reported. No reason was given for why Polyansky stepped down.

I have great affection for her. I'll do everything I can to help her. It's still very much the team I put in place. I just don't have the endurance to 12- to 14-hour days seven days a week anymore, Rollins said. David and I have been a team for a long time. It's just a good time to make a change.

Rollins also didn't beat around the bush when it came to discussing Bachmann's chances of winning the GOP nomination.

I think, legitimately, it's a Romney-Perry race, Rollins said. I think she's the third candidate at this point in time -- which is way different and better than we'd thought when we started this thing -- and she's very much in this thing.

Bachmann said one of her strategists would take over on an interim basis; Rollins will stay on in a senior advisory role.

In less than 50 days, and with few resources than other campaigns, Ed was the architect that led our campaign to a historic victory in Iowa, Bachmann said in a statement Monday night. I am grateful for his guidance and leadership, and fortunate to retain his valuable advice even though his health no longer permits him to oversee the day-to-day operations of the campaign.