According to a Morning Consult poll conducted Wednesday, the Vermont independent is the first choice for 29 percent of Democratic primary voters, up 4 percentage points since polling conducted Feb. 4-9. Biden’s support fell 3 points during that time to 19 percent, leaving him 1 point ahead of former New York City Mayor Michael Bloomberg.

Former South Bend Mayor Pete Buttigieg of Indiana, who placed second in New Hampshire but leads Sanders by a whisker in the race for Democratic National Convention delegates, saw no change in his first-choice support, while the Granite State’s third-place finisher, Amy Klobuchar, improved 2 points, to 5 percent. She trails Sen. Elizabeth Warren (D-Mass.) by 5 points.

The survey of 2,639 registered voters nationwide who indicated they may vote in the Democratic primary or caucuses in their state has a 2-point margin of error.

The results are poor reading for Biden, who continues a dramatic drop that erases the national lead he held for over a year until his fourth-place showing in the Feb. 3 Iowa caucuses. The decline in Biden’s support comes amid faltering voter confidence over his perceived general-election strength, even as he banks his candidacy for the Democratic nod on the more diverse electorates driving nominating contests in Nevada and South Carolina ahead of Super Tuesday.