Barack Obama just posed a challenge to Hillary Clinton on Social Security. On substance he was great, noting that Clinton's promise to cap at $ 97,000 the annual income that could taxed for Social Security taxes protected the top 6 percent of Americans. He stood up to counter her, offering a direct challenge, and she neither backed down or away. Then he sat down, and she rebutted. I barely heard what she said, so mesmerized was I by Clinton's physical attitude, which really was strong; firm stance and hands moving in unison. That, combined with Obama's weak answer on the question of driver's licenses for undocumented workers, seemed to leave the contest's Number 2 man somewhat diminished. --Adele M. Stan