Michele Bachmann is flailing around accusing all the US government officials of Muslim heritage of being connected to the Muslim Brotherhood (which in turn she misunderstands as a radical group). Not only did she attack the aide to Hillary Clinton, Huma Abedin, but when Rep. Keith Ellison complained about her McCarthyite campaign, she launched the same accusation at him (Ellison is one of two Muslims in the Congress).
Bachmann's bizarre behavior (there, I've been redundant) is alarming the Republican establishment. Even right wing poobah Mike Rogers (R-Michigan), head of the House intelligence committee, after initially supporting her, has backed away from Bachmann's nuttiness, at least on this issue.
Given her own strong ties to the Iranian terrorist organization, the Mojahedin-e Khalq (MEK or People's Holy Jihadis), Bachmann is in a weak position to accuse other people. The MEK was involved in taking US diplomats hostage, and then in the 1990s allied with Saddam Hussein. In fact, her colleagues in Congress should investigate if she has taken money from the MEK, or has given them material assistance. She is, I've argued much closer to the Muslim Brotherhood than the people she is accusing. It is extremely scary that this woman is on the House Intelligency Committee. She would even be in a position to share US intelligence with MEK terrorists.
Establishment Republicans are increasingly dissociating themselves from her just because they don't want to be tarred by her brush. And, in general, you don't want the Republican brand being dominated by Bachmann in an election year. But there is another consideration that may have them running from her.