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President Barack Obama speaks during a campaign stop at the Auraria Events Center Aug. 8, 2012, in Denver, Colo. Mr. Obama spoke about the economy and how he says Obamacare has helped women and their access to healthcare.
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Republican presidential candidate Mitt Romney speaks during a campaign event at Central Campus High School on Aug. 8, 2012, in Des Moines, Iowa.
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Republican presidential candidate Mitt Romney (R) looks at corn with Iowa Secretary of Agriculture Bill Northey (C) and farmer Lemar Koethe (L) on Aug. 8, 2012, in Des Moines, Iowa.
Justin Sullivan
Republican presidential candidate Mitt Romney speaks during a campaign event at Central Campus High School on Aug. 8, 2012, in Des Moines, Iowa.
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Republican presidential candidate Mitt Romney speaks during a campaign event at Central Campus High School on Aug. 8, 2012, in Des Moines, Iowa.
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Republican presidential candidate Mitt Romney speaks during a campaign event at Central Campus High School on Aug. 8, 2012, in Des Moines, Iowa.
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Sandra Fluke gets a hug from President Barack Obama after introducing him to speak during a campaign stop at the Auraria Events Center Aug. 8, 2012, in Denver, Colo. Fluke is the Georgetown Law Student who testified before Congress earlier this year in favor of insurance coverage of contraception.
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Republican presidential candidate Mitt Romney (C) tours a corn field with Iowa Secretary of Agriculture Bill Northey (R) and farmer Lemar Koethe on Aug. 8, 2012, in Des Moines, Iowa.
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President Barack Obama speaks during a campaign stop at the Auraria Events Center Aug. 8, 2012, in Denver, Colo.
Marc Piscotty
President Barack Obama waves to the crowd after speaking during a campaign stop at the Palace of Agriculture on the Colorado State Fairgrounds Aug. 9, 2012, in Pueblo, Colo.
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President Barack Obama shakes hands as he takes the stage before speaking during a campaign stop at the Auraria Events Center Aug. 8, 2012, in Denver, Colo.
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Republican presidential candidate Mitt Romney (R) looks at corn with corn farmer Lemar Koethe in a cornfield on Aug. 8, 2012, in Des Moines, Iowa.
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Republican presidential candidate Mitt Romney (R) greets supporters after touring the corn farm of Lemar Koethe on Aug. 8, 2012, in Des Moines, Iowa.
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President Barack Obama speaks during a campaign stop at the Palace of Agriculture on the Colorado State Fairgrounds Aug. 9, 2012, in Pueblo, Colo.
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President Barack Obama shakes hands after speaking during a campaign stop at the Palace of Agriculture on the Colorado State Fairgrounds Aug. 9, 2012, in Pueblo, Colo.
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President Barack Obama takes the stage before speaking during a gassroots campaign stop at the Palace of Agriculture on the Colorado State Fairgrounds Aug. 9, 2012, in Pueblo, Colo.
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President Barack Obama speaks during a campaign stop at the Auraria Events Center Aug. 8, 2012, in Denver, Colo.
Justin Sullivan/Getty Images
Republican presidential candidate Mitt Romney carries bags as he walks to his campaign plane at Des Moines International Airport on Aug. 8, 2012, in Des Moines, Iowa.
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Republican presidential candidate Mitt Romney carries bags as he walks to his campaign plane at Des Moines International Airport on Aug. 8, 2012, in Des Moines, Iowa.
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Republican presidential candidate Mitt Romney carries bags as he boards his campaign plane at Des Moines International Airport on Aug. 8, 2012, in Des Moines, Iowa.
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President Barack stands inside the Oval Office before boarding Marine One to depart the White House Aug. 8, 2012, in Washington, D.C.
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President Barack Obama walks across the South Lawn before boarding Marine One to depart the White House Aug. 8, 2012, in Washington, D.C.
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President Barack Obama walks across the South Lawn before boarding Marine One to depart the White House Aug. 8, 2012, in Washington, D.C.
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President Barack Obama waves to guests on the South Lawn while boarding Marine One to depart the White House Aug. 8, 2012, in Washington, D.C.
