Online poll: Sanders up by 1 point in Iowa

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A week before the Iowa caucuses, Bernie SandersBernie SandersWasserman Schultz's primary rival: She can’t count on Clinton fans The Hill's 12:30 Report Sen. Boxer fires back at Sanders aide: 'He wasn't there' MORE has a slim lead over Hillary ClintonHillary Rodham ClintonWoman who accused Bill Clinton of rape 'not unhappy' to be in new Trump ad Wasserman Schultz's primary rival: She can’t count on Clinton fans Clinton campaign: Email setup ‘not unique’ MORE in the race for the Democratic Presidential nomination, according to a new online poll.

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The CBS News “Battleground Tracker” poll released Sunday morning shows Sanders with a 1-point lead over Clinton, 47 to 46 percent.

Martin O’Malley has 5 percent.

Sanders maintains his wide lead in New Hampshire, 57 to 38 percent, according to the poll, while Clinton still commands a strong advantage, 60 to 38 percent, in South Carolina.

YouGov conducted the poll for CBS News. It has an 8.9 percent margin of error in Iowa, an 8.2 percent margin of error in New Hampshire and a 9.4 percent margin of error in South Carolina.

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