The attack on Michele Bachmann and her migraine headache situation is, indeed, sexism. I'm half waiting for Pawlenty and the others to make a stink about whether or not Bachmann will go through menopause while in office.
Oh, and yes, Tim Pawlenty endorsed the "migraines make her unqualified" line. I'm no fan of Michele Bachmann, but Pawlenty is a dick.