Worried Democrats rush to slow front-runner Sanders

STEVE PEOPLES, MEG KINNARD and BILL BARROW Associated Press HILTON HEAD ISLAND, S.C. (AP) — Worried Democrats on Monday intensified their assault against the party's presidential front-runner, Bernie Sanders, as the Vermont senator marched toward South Carolina's weekend primary eyeing a knockout blow. At least three leading candidates, Joe Biden, Pete Buttigieg and Mike Bloomberg, reinforced their anti-Sanders rhetoric with paid attack ads for the first time. And a new political group was spending big to undermine Sanders' standing with African American voters. "Socialist Bernie Sanders is promising a lot of free stuff," says a brochure sent to 200,000 black voters in South Carolina by The Big Tent Project, a new organization trying to derail Sanders' candidacy. "Nominating Bernie