In this 2008 AP file photo, Michelle Obama campaigns for her husband, then-Democratic presidential candidate Sen. Barack Obama, at a rally in Rochester, Minn. She's mingled barefoot among Aspen's elite, stirred a Vermont utility executive to tears and bucked up disenchanted New Yorkers. The 2012 presidential campaign is well under way for Michelle Obama, and the first lady is promising to put herself into the election effort like never before. More than a year from Election Day, she is hauling in millions in campaign cash and sketching a portrait of her husband drawn with an intimacy that no one else could duplicate. (AP Photo/Jim Mone, File)

Question: How important is Michelle Obama to her husband's re-election hopes?