Police gathered at the east entrance of Columbine High School in Littleton, Colo., on April 20, 1999, after two teen students went on a shooting rampage before turning the weapons on themselves. Mark Leffingwell/AFP/Getty Images hide caption

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A Mitt Romney supporter holds up a sign showing her love for Romney and Denver Broncos quarterback Tim Tebow at a rally for the GOP presidential candidate at Arapahoe High School this week in Centennial, Colo. Marc Piscotty/Getty Images hide caption

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After Glum Night, Romney May Find Signs Of Hope In Colorado Swing County
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President Barack Obama greets people outside the Old Market Deli in Cannon Falls, Minn., on the Aug. 15, during a Midwest bus tour. The same day he said he likes the term "Obamacare."

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