“There’s no denying that this is a good poll for Bernie Sanders. He leads, but it’s not an uncontested lead,” said pollster J. Ann Selzer, president of Selzer & Co., which conducted the poll. “He’s got a firmer grip on his supporters than the rest of his compatriots.”…

The percentage of those who say their mind is made up about which candidate to support on caucus night has risen to 40% — up 10 percentage points from November. But that leaves 45% who say they could still be persuaded to support someone else and another 13% who have not picked a favorite candidate yet…

Other Democratic candidates — including those banking on a late burst of momentum — failed to gain much ground in the January poll. U.S. Sens. Amy Klobuchar of Minnesota and Cory Booker of New Jersey both held steady: Klobuchar at 6% and Booker at 3%. Entrepreneur Andrew Yang grew his support from 3% in November to 5% today.