It's like a Washington sequel to "Reservoir Dogs." Finally rested up from their cynical assault last year on John Kerry's patriotism, the most ruthless smear squad in American politics is back together again. And they're revving up for another nasty job. Their latest ugly enterprise? Sliming the AARP, which had the nerve to come out against President Bush's plan to privatize Social Security. This is the same gang of rhetorical hatchet men behind the deceptively named Swift Boat Veterans for Truth. During last year's presidential campaign, they were telling vicious lies about Kerry's combat record in Vietnam. Now, they're turning...