Michelle Obama fills in

<div class="meta image-caption"><div class="origin-logo origin-image none"><span>none</span></div><span class="caption-text">  Democratic presidential hopefuls from left: former Sen. Mike Gravel, D-Alaska; Sen. Christopher Dodd, D-Conn.; former Sen. John Edwards, D-N.C.; Sen. Hillary Rodham Clinton, D-N.Y.; Sen. Barack Obama, D-Ill.; New Mexico Gov. Bill Richardson; Sen. Joseph Biden, D-Del.; and Rep. Dennis Kucinich, D-Ohio, stand together before the start of the debate sponsored by CNN, YouTube and Google at The Citadel military college in Charleston, S.C., Monday, July 23, 2007. &#40;AP Photo&#47;Charles Dharapak&#41; </span></div>
October 24, 2008 12:40:02 PM PDT
Michelle Obama is filling in for her husband in Ohio today, while he visits his seriously ill grandmother in Hawaii. She told a rally in Columbus that he's not paying attention to the favorable poll numbers, and that he'll campaign in the final days as if he's 20 points behind.

In an interview on ABC's Good Morning America, broadcast today, Barack Obama said the family is praying that his grandmother makes it to Election Day but they're not sure she will.

Obama has said he missed a chance to visit his mother just before she died of ovarian cancer and he didn't want to repeat that mistake.