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  Democratic presidential hopeful Barack Obama walks between two American Flags to a news conference in Chicago. (Alex Brandon, AP)
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  Republican presidential candidate John McCain left, talks Ralph Naess, public and cultural programs manager, while walking on a trail near the Cedar River Shoreline. (Jeff Chiu, AP)
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  Republican presidential candidate John McCain smiles after arriving in Portland. (Jeff Chiu, AP)
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  Democratic presidential hopeful Barack Obama plays pool at Schultzie's bar in South Charleston in anticipation of the state's primary election. (Jae C Hong, AP)
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  Supporters cheer for Democratic presidential hopeful Barack Obama at a rally in Louisville. (Jae C Hong, AP)
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  Democratic presidential hopeful Barack Obama looks downward as he is introduced at a campaign event in Cape Girardeau. (Jae C Hong, AP)
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  Democratic presidential hopeful Barack Obama arrives on Capitol Hill in Washington. (Lawrence Jackson, AP)
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  Democratic presidential hopeful Barack Obama is introduced at a town hall-style meeting. (Jae C Hong, AP)
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  Former President Bill Clinton speaks at Roseburg High School in Roseburg while campaigning for his wife. (The News-Review, Robin Loznak, AP)
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  A poster for Democratic presidential hopeful Hillary Rodham Clinton hangs in a window as supporters mill around following the departure of Chelsea Clinton after a campaign stop in San Juan, Puerto Rico. (Brennan Linsley, AP)
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  Chelsea Clinton stands with supporters during a question and answer session with the public at a campaign stop in San Juan, Puerto Rico. (Brennan Linsley, AP)
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  Democratic presidential hopeful Hillary Rodham Clinton addresses supporters during her West Virginia Primary night rally. (Steve Helber, AP)
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  Barack Obama speaks to members of the Democratic Party of Wisconsin at their Founders Day Dinner at the Midwest Express Centre on February 16 2008 in Milwaukee, Wisconsin. (Scott Olson, AFP)
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  Hillary Clinton poses for a picture with a fan following a speech to members of the Democratic Party of Wisconsin at their Founders Day Dinner at the Midwest Express Centre on February 16 2008, in Milwaukee, Wisconsin. (Scott Olson, AP)
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  A supporter of Barack Obama listens as the candiadte speaks at a campaign rally in the Midwest Airlines Centre on February 15 2008 in Milwaukee, Wisconsin.(Joshua Lott, AFP)
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  John McCain speaks during the Reagan Day Dinner at the American Serb Memorial Hall during a campaign stop on February 15 2008 in Milwaukee, Wisconsin. (Joshua Lott, AFP)
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  Hillary Clinton speaks to a group concerned about home foreclosures at the Fair River Oaks Council on February 14 2008 in Dayton, Ohio. (Mark Lyons, AFP)
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  John McCain speaks during a press conference at the Capitol Hill Club in Washington DC, on February 13 2008. (Saul Loeb, AFP)
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  Angie Garcia of El Paso, Texas, shows her support of Hillary Clinton at the Don Haskins Arena at UTEP University on February 12 2008 in El Paso, Texas. (Rick Gershon, AFP)
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  Jake Trautwein of Great Falls, celebrates at a primary night party for John McCain on February 12 2008 in Alexandria, Virginia. (Alex Wong, AFP)

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