WASHINGTON (CNN) Americans are becoming more likely to think President Donald Trump will win a second term in office, while Joe Biden stands atop a crowded field of Democrats perhaps looking to replace him, according to a new CNN Poll conducted by SSRS.

The public is split over whether they think the President will win a second term -- 46% say he will and 47% say he won't. But that's a steep improvement for him since March, when 54% of adults said they thought he'd lose his bid for a second term. The share seeing a second Trump win in the offing has risen across party lines. The increase is a bit sharper among men (up 8 points), independents (from 39% in March to 47% now) and those who are enthusiastic about voting in this year's midterms (from 37% in March to 46% now).

The President's partisans are just as likely to want him renominated now as they were in March: Seventy-four percent of Republicans and Republican-leaning independents say he should be the party's nominee in 2020, and 21% would rather see someone else at the top of the ticket.

In the race for the Democratic nomination to face Trump, former Vice President Biden leads a massive potential field. The poll asked Democrats and Democratic-leaning independents to choose their preferred presidential nominee among 16 possible candidates. Biden tops the list with 33% support, followed by independent Sen. Bernie Sanders of Vermont, the 2016 runner-up, at 13%. Sen. Kamala Harris of California follows at 9%, with Sen. Elizabeth Warren of Massachusetts at 8%. Sen. Cory Booker of New Jersey and 2004 Democratic nominee John Kerry garnered 5% support.

Former New York Mayor Michael Bloomberg, who recently became a registered Democrat and spoke in New Hampshire on Saturday night, stands at 4% in the poll. Rep. Beto O'Rourke of Texas, currently running against Sen. Ted Cruz, also lands at 4%. Less than 1% said they back Rep. John Delaney of Maryland, the only declared candidate in the field, and just 1% choose attorney Michael Avenatti, who has been visiting early primary and caucus states.

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