Buttigieg pulled in 25 percent, up two points from Thursday night, while Bernie Sanders held steady at 24 percent. Elizabeth Warren and Joe Biden also rose by two percentage points, placing Warren third with 14 percent and Biden fourth with 11.

These slight changes seem to be driven by a four-point drop in the number of undecided voters climbing off the fence, a process likely to be enhanced by Friday night’s televised debate.

Buttigieg drew more support from male voters than Thursday night, while Sanders dropped four points among registered Democrats.