Democrat Barack Obama told seniors Sunday that Republican John McCain would threaten the Social Security that they and millions like them depend on because he supports privatizing the program.Obama turned to a bedrock, pocketbook issue as he spoke to about 130 people at an assisted living facility and sought to tie the GOP's presidential nominee-in-waiting to an unpopular President Bush on an issue that motivates seniors."Let me be clear, privatizing Social Security was a bad idea when George W. Bush proposed it, it's a bad idea today," Obama said. "That's why I stood up against this plan in the Senate...
