In this June 8, 2012, photo, supporters of Republican presidential candidate, former Massachusetts Gov. Mitt Romney reaches out to shake his hand during a campaign stop in Council Bluffs, Iowa. Republican groups are heavily outspending their cross-party counterparts on television advertising in the early stages of the fall campaigns for the White House and control of the Senate, tempering President Barack Obama's financial advantage over Romney and sparking blunt expressions of concern from leading congressional Democrats. (AP Photo/Evan Vucci)

Associated Press
In this June 8, 2012, photo, supporters of Republican presidential candidate, former Massachusetts Gov. Mitt Romney reaches out to shake his hand during a campaign stop in Council Bluffs, Iowa. Republican groups are heavily outspending their cross-party counterparts on television advertising in the early stages of the fall campaigns for the White House and control of the Senate, tempering President Barack Obama's financial advantage over Romney and sparking blunt expressions of concern from leading congressional Democrats. (AP Photo/Evan Vucci)
In this June 8, 2012, photo, supporters of Republican presidential candidate, former Massachusetts Gov. Mitt Romney reaches out to shake his hand during a campaign stop in Council Bluffs, Iowa. Republican groups are heavily outspending their cross-party counterparts on television advertising in the early stages of the fall campaigns for the White House and control of the Senate, tempering President Barack Obama's financial advantage over Romney and sparking blunt expressions of concern from leading congressional Democrats. (AP Photo/Evan Vucci)
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