WASHINGTON – One of the oddest Web posts making the rounds is a series of blurry videos from Capitol Hill showing people coming and going from a closed-door meeting of President Barack Obama's new deficit commission. The mundane scenes have a sinister cast for activists who say the commission is at work on a secret plan to gut Social Security. Nancy Altman, whose group, Social Security Works, shot the footage, says the threat to the nation's primary social safety net is greater now than at any time in the program's 75-year history. "This is going to affect every single American...