Michelle Obama

First lady Michelle Obama speaks at a campaign event for Sen. Russ Feingold, D-Wis., Wednesday, Oct. 13, 2010, in Milwaukee. (AP Photo/Morry Gash)

Alexi Giannoulias, Michelle Obama

First lady Michelle Obama appears with U.S. Senate candidate Alexi Giannoulias, at a campaign fundraiser, Wednesday, Oct. 13, 2010, in Chicago. Giannoulias faces Republican Congressman Mark Kirk, in the November election for President Barack Obama's old Senate seat. (AP Photo/M. Spencer Green)

Alexi Giannoulias, Michelle Obama

First lady Michelle Obama appears with U.S. Senate candidate Alexi Giannoulias, at a campaign fundraiser, Wednesday, Oct. 13, 2010, in Chicago. Giannoulias faces Republican Congressman Mark Kirk, in the November election for President Barack Obama's old Senate seat. (AP Photo/M. Spencer Green)

Michelle Obama

First lady Michelle Obama speaks at a campaign event for Sen. Russ Feingold, D-Wis., right, Wednesday, Oct. 13, 2010, in Milwaukee. (AP Photo/Morry Gash)

Alexi Giannoulias, Michelle Obama

First lady Michelle Obama appears with U.S. Senate candidate Alexi Giannoulias, at a campaign fundraiser, Wednesday, Oct. 13, 2010, in Chicago. Giannoulias faces Republican Congressman Mark Kirk, in the November election for President Barack Obama's old Senate seat. (AP Photo/M. Spencer Green)

Michelle Obama

First lady Michelle Obama speaks at a campaign fundraiser for Illinois congressional candidates, Bill Foster, Debbie Halvorson, and Dan Seals, Wednesday, Oct. 13, 2010, in Chicago. Obama began a cross country campaign tour today, to rally support for Democratic candidates across the nation. (AP Photo/M. Spencer Green)

Michelle Obama

First lady Michelle Obama speaks at a campaign event for Sen. Russ Feingold, D-Wis., Wednesday, Oct. 13, 2010, in Milwaukee. (AP Photo/Morry Gash)

Michelle Obama

First lady Michelle Obama speaks at a campaign fundraiser for Illinois congressional candidates, Bill Foster, Debbie Halvorson, and Dan Seals, Wednesday, Oct. 13, 2010, in Chicago. Obama began a cross country campaign tour today, to rally support for Democratic candidates across the nation. (AP Photo/M. Spencer Green)

Michelle Obama, Bill Foster, Debbie Halvorson, Dan Seals,

First lady Michelle Obama speaks at a campaign fundraiser for Illinois congressional candidates, Bill Foster, left, Debbie Halvorson, right, and Dan Seals, Wednesday, Oct. 13, 2010, in Chicago. Obama began a cross country campaign tour today, to rally support for Democratic candidates across the nation. (AP Photo/M. Spencer Green)