A week before the Iowa caucuses, Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE has a slim lead over Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE in the race for the Democratic Presidential nomination, according to a new online poll.

ADVERTISEMENT

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.