Voters ushered her into office. Now, a bullet has prematurely pushed her out. U.S. Rep. Gabrielle Giffords of Arizona resigned from Congress this week after five years in the House and more than a year after a gunman killed six people and injured a dozen others. Slowed by speech and movement impairments after being shot in the head, Giffords pinned her decision on her continuing recovery and desire to "do what is best for Arizona." Doing what she thought best for her state and country hallmarked her service in the House. She earned a reputation as a centrist who rebuffed partisanship and reached across the aisle. A practice that a departing Giffords urged Congress to emulate: "We can do so much more by working together," she said. While in office, Giffords sponsored successful legislation to beef up border security. She became a forceful advocate for veterans and military service members. And she was perhaps Congress' brightest proponent on solar energy. A bullet cut short her tenure. Not her dedication. She sees her resignation as a ta-ta for now — not a farewell from public service. That Tombstone — "the town too tough to die" — fell within her district always gave Giffords gratification. Fitting, too, for an American who, having won her fight to survive, is determined to serve again.