Online poll: Sanders up by 1 point in Iowa
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A week before the Iowa caucuses, Bernie SandersBernie SandersLawmakers, activists remember civil rights icons to mark 'Bloody Sunday' Progressives' majority delusions politically costly Sinema pushes back on criticism of her vote against minimum wage MORE has a slim lead over Hillary ClintonHillary Diane Rodham ClintonGraham: Trump can make GOP bigger, stronger, or he 'could destroy it' Hillicon Valley: China implicated in Microsoft breach | White House adds Big Tech critic | QAnon unfazed after false prediction Jill Biden redefines role of first lady 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.