Joe Biden has widened his lead over two progressive senators in a new poll released Tuesday, giving the former vice president much better news a day after another survey found his advantage slipping.

A new Morning Consult poll showed Biden with 33% support for the Democratic presidential nomination, extending his lead by 2 percentage points since the last poll conducted a week ago. Sen. Bernie Sanders of Vermont came in second with 20%, followed by Sen. Elizabeth Warren of Massachusetts with 15%. Both senators maintained their numbers since last week's poll.

The Morning Consult survey comes a day after Monmouth University's poll showed Biden losing ground and landing in a virtual three-way tie with Sanders and Warren. The senators each clinched 20%, followed by Biden with 19%. While it was a big drop for the former vice president, his campaign described Monmouth's survey as an "outlier" with a small sample size. Morning Consult uses a vastly larger sample size in its polling.

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Among voters in early primary and caucus states polled by Morning Consult, Biden further extended his lead over Sanders to 16 points. Those polled include voters in Iowa, New Hampshire, South Carolina and Nevada, showing promising news for the former vice president in the first four states to cast ballots in the nominating contests.

Biden and Sanders have the highest favorability ratings among the Democratic field in Morning Consult's poll. Seventy-five percent of voters have a favorable opinion of Biden, while 18% have an unfavorable view. Sanders has a similar 75%-18% favorability rating.

Tuesday's poll trends with a majority of other polls that find Biden in the lead and a solidified top three that includes Sanders and Warren. All other candidates polled in the single digits, with Sen. Kamala Harris of California in fourth place with 8%.

Emerson College also released a new poll Tuesday that finds Biden with a 7-point lead over Sanders, 31%-24%. Warren garners 15% and Harris rounds out the top four with 10%. All other candidates polled at 4% or less.

Emerson's survey polled head-to-head matchups against President Donald Trump, finding that Biden and Sanders are the only two candidates to defeat him. The poll found Biden leading Trump, 54%-46%, and Sanders defeating Trump 52%-48%. Both Warren and Harris tie Trump, but the president narrowly defeats South Bend, Indiana, Mayor Pete Buttigieg, 51%-49%.

Neither Morning Consult or Emerson's surveys are part of the Democratic National Committee's approved polls to qualify for the primary debates. Wednesday is the deadline to qualify for the September debate, and it appears increasingly likely that only 10 candidates make the stage.

The Morning Consult poll was conducted from Aug. 19 to 25 and surveyed 17,303 registered voters. The early primary state sample includes 745 voters from Iowa, New Hampshire, South Carolina and Nevada. The margin of error was 1 percentage point.