President-elect ( Joe Biden) on Jan. 8 promised to “defeat” the National Rifle Association while he’s in office.Biden’s official Twitter account was responding to former Rep. Gabby Giffords (D-Ariz.), who was among 14 people wounded in a shooting rampage by Jared Lee Loughner in Tucson in 2011; six people died in the attack. Giffords had recounted how her life and community “changed forever.”“But the attack did not break me—or the people I represented in Congress. We came together, turned pain into purpose, and found hope in each other,” she wrote, adding that she continues to work to “achieve a safer...