Biden currently has the support of 27% of Democrats and Democratic-leaning voters, which is similar to his 28% support in March and 29% in January. Support for Vermont Sen. Bernie Sanders is currently at 20%, which is down slightly from 25% in March, but still higher than his 16% support in January.

“If Biden does enter the race this week, he starts off with a fairly stable amount of good will from Democrats. We might even expect to see a small bump after his announcement, but the bigger question will be what happens when those voters start taking a closer look at him on the campaign trail. It’s a long way to Iowa and a lot can happen,” said [Monmouth polling director Patrick] Murray.

South Bend, Indiana Mayor Pete Buttigieg currently has 8% support. He registered less than 1% in prior Monmouth polls. California Sen. Kamala Harris has 8% support, off just slightly from 10% in March and 11% in January. Rounding out the field of top contenders are Massachusetts Sen. Elizabeth Warren at 6% (from 8% in both March and January) and former Texas Congressman Beto O’Rourke at 4% (6% in March and 7% in January).