Air Force One is parked at John F. Kennedy International Airport before President Obama's July 30 departure from New York City, where he was attending a private fundraiser. Pablo Martinez Monsivais/AP hide caption

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Mitt Romney speaks during a campaign stop at the Jefferson County Fairgrounds this month in Golden, Colo. Justin Sullivan/Getty Images hide caption

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Sheldon Adelson and his wife, Miriam, leave a speech by Republican presidential candidate Mitt Romney in Jerusalem on Sunday. Uriel Sinai/Getty Images hide caption

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A campaign sticker for Republican presidential candidate Mitt Romney is seen on a sign for Romney Street in London on Wednesday, as Romney arrived to meet with leaders, hold fundraisers and attend the opening of the Olympics. Charles Dharapak/AP hide caption

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Mitt Romney speaks at a campaign event in Bow, N.H., Friday. The campaigns have released their monthly financial reports, with Romney showing an advantage over President Obama. Charles Dharapak/AP hide caption

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Karen Bleier /AFP/Getty Images

Montana Attorney General Steve Bullock sought to prevent the U.S. Supreme Court's 2010 Citizens United decision from being used to strike down a state law restricting corporate campaign spending. On Monday, the Supreme Court rejected Bullock's argument, holding that "there can be no serious doubt" that Citizens United applies to Montana law. Matthew Brown/AP hide caption

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