NewsweekFeb. 14 issue - He got the ball rolling at the State of the Union. But it's no ordinary fight. On trial: America's core belief in the social contract, and its faith in the private sector. In the abbreviated genealogy of wristband empathy, "Live Strong" yellow was first, followed by pink for breast cancer, blue for tsunami relief and olive green for the troops in Iraq. Now Rock the Vote, a youth-oriented grass-roots group, hopes to make a new jewelry statement. The color is unchosen but the message is settled: "I [Heart] Social Security." In tandem with AARP, the seniors'...