U.S. Senator Barack Obama smiles as he campaigns for Iraq War veteran and Democratic Congressional candidate Tammy Duckworth in Elmhurst, Illinois, November 6, 2006. Duckworth was co-piloting a Black Hawk helicopter north of Baghdad on November 12, 2004, when a rocket-propelled grenade struck the cockpit of her aircraft and exploded. Ten days later, when she woke up at Walter Reed Memorial Hospital in Maryland, she learned that the explosion would cost her both of her legs and had shattered her right arm. REUTERS/John Gress (UNITED STATES)