Bachmann quits, Graves too?

Michele Bachmann's sudden announcement that she was bowing out of the 6th CD. She won a hotly contested but close race last time around. Here presidential campaign was also under investigation by the office of confessional ethics.  She definitely made an impact on MN politics. At least she was the one politicians name everybody knew considering most can't name their member of congress. 

Jim graves should have stayed in the race if he was serious about running for office. So was he not serious about representing the citizens of the 6the CD?