A voter emerges from the voting booth after casting her ballot in the Republican presidential primary at a laundromat being used as a polling station in Chicago, Illinois, March 20.

Wiley Corbin casts his vote at a polling place inside the El Mamey Bar on March 20, in Chicago, Illinois. Voter turnout is expected to be low. The polling place inside the El Mamey Bar had seen six voters in it's first 3.5 hours of operation.

Landon Peterson peeks out of the voting booth while his mother Meghan votes March 20, at Christian union Church in Metamora, Illinois. White House hopeful Mitt Romney eyed a big win in President Barack Obama's home state Tuesday as he sought to clinch the Republican nomination and focus on November's general election. Polls across Illinois opened for the state primary at 6:00 am (1100 GMT) with former Massachusetts governor Romney the odds-on favorite to win.

Kiwana Annons casts her ballot at South Chicago Dodge Chrysler Jeep in the state primary on March 20, in Chicago, Illinois. Republican presidential candidates spent the week campaigning leading up to the state's primary elections, when 54 GOP delegates are up for grabs. With former Massachusetts Gov. Mitt Romney in the lead on delegates, fellow candidate, former Pennsylvania Sen. Rick Santorum continues to compete for the 1,444 necessary to secure the nomination before the last primary, in Utah on June 26.

Republican presidential candidate Rep. Ron Paul, R-Texas, reaches out from his car window to grab a book to autograph for a supporter as he leaves a campaign stop on Tuesday, Jan. 17, in Rock Hill, S.C.

U.S. Republican presidential candidate and former Speaker of the House Newt Gingrich has his earlobes rubbed backstage by his wife Callista before speaking at the Art Trails Gallery in Florence, South Carolina, Jan. 17. The South Carolina Primary will be held on January 21.

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, speaks on his phone after getting into an elevator before he addresses Business Speaks, a business and economic forum hosted by the South Carolina Chamber of Commerce, in Columbia, S.C., on Tuesday, Jan. 17, 2012.

Republican presidential candidate and Texas governor Rick Perry greets a man at the BIPEC GOP Primary Candidates Forum in Columbia, South Carolina Jan. 17.

Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets people during a campaign rally on Jan.17 in Florence, South Carolina.