The Hillary Clinton campaign is stepping up its criticism of Bernie Sanders, and a new poll provides a reason why: The two Democrats are neck-and-neck in Iowa and New Hampshire.br Clinton leads Sanders by just three points in Iowa, 48 to 45, according a new NBC NewsWall Street JournalMarist poll released Sunday.br Martin O'Malley is third at 5, three weeks out from the Iowa caucuses on Feb. 1 that begin the nomination process.br Sanders, meanwhile, leads Clinton in New Hampshire 50-46, the poll said, with O'Malley at 1.br The New Hampshire primary is Feb. 9.