DOVER, N.H. — Republican presidential candidate Herman Cain declined to raise questions about fellow contender Michele Bachmann's health Thursday night, dismissing the Minnesota congresswoman's migraine headaches as a "non-issue" in the GOP contest."If she's showing up for her events, and she's doing what she needs to do as a United States congresswoman, people shouldn't worry about her migraines," Cain told The Associated Press after a fundraiser for the New Hampshire GOP.