Senate Democrats are nearly fully united in staging an unprecedented filibuster against Supreme Court nominee Neil Gorsuch, but the partisan blockade of his confirmation is likely to jeopardize some of the party’s most vulnerable members facing re-election next year.

Perhaps, that is why the only three Democrats up for re-election next year who have broken ranks so far — Sens. Joe Manchin (D-W.Va.), Joe Donnelly (D-Ind.), and Heidi Heitkamp (D-N.D.)  — all hail from three of the states that most heavily backed President Donald Trump in last year’s election.

“These are people in states that elected Donald Trump. And Chuck Schumer has chosen a path of gridlock and obstructionism that is historic.”

But other Democrats — including some who have come out against Gorsuch and others who remain publicly undecided — also face peril. Polls reveal little appetite among the public for the scorched-earth strategy Senate Minority Leader Chuck Schumer (D-N.Y.) has adopted. A HuffPost/YouGov survey last week found 40 percent of Americans think Gorsuch should be confirmed, while just 23 percent were opposed.

A Politico poll found support for Gorsuch by a similar margin of 44 percent in favor and 23 percent against. Even a quarter of Democrats favored confirmation, compared with 39 percent opposed. A CBS News poll last month pegged support for Gorsuch at 29 percent, compared with 16 percent opposed. That was higher than support registered for Justice Elena Kagan when she was nominated and about the same as support for Justice Sonia Sotomayor before her confirmation vote.

The Judicial Crisis Network, which is supporting Gorsuch, announced it is spending $1 million on ads in the states of four vulnerable Democrats — Indiana, Colorado, Montana and Missouri.

“These are people in states that elected Donald Trump,” the group’s general counsel, Carrie Severino, told LifeZette. “And Chuck Schumer has chosen a path of gridlock and obstructionism that is historic … They should be representing the citizens of their states.”

Here are the top five Democratic senators with the most to lose by filibustering:

Senator: Jon Tester (D-Mont.)
Position on Gorsuch: He has said will vote “no” and support a filibuster.
Last election: He won by 1.8 percentage points.
2016 results: Trump won by 20.1 points.
Why he should fear: Tester must walk a fine line in Montana. He has failed to crack 50 percent in either of his two races, and Montana is a conservative-leaning state. Tester emphasizes his moderate credentials, including his support for gun rights, and presents himself as pragmatic. But jointing the filibuster might make it harder to maintain that image, particularly if he draws a top-tier challenger.

Senator: Claire McCaskill (D-Mo.)
Position on Gorsuch: She has said will vote “no” and support a filibuster.
Last election: She won by 15.5 percentage points.
2016 results: Trump won by 18.5 points.
Why she should fear: Although McCaskill had the fortune of a relatively easy re-election campaign in 2012 because of the self-inflicted wounds of Republican candidate Todd Akin, the Show Me State traditionally leans Republican. In McCaskill’s first race in 2006 — an extremely bad cycle for Republicans — she squeaked by without a majority of the vote, winning by just 2.3 points. In addition, Trump won this state handily in 2016. Pragmatic voters in Missouri may tolerate a “no” vote but likely will view a filibuster as extreme.

Senator: Sherrod Brown (D-Ohio.)
Position on Gorsuch: He has said will vote “no” and support a filibuster.
Last election: He won by 6 percentage points.
2016 results: Trump won by 8.1 points.
Why he should fear: Even setting aside the Supreme Court issue, Brown’s views are more liberal than his moderate-to-conservative constituents. His 6-point victory in 2012 was half as great as his 12-point win in 2006. Ohio was also one of Trump’s best swing states. What’s more, Sen. Rob Portman (R-Ohio) turned what was supposed to be one of the nation’s tightest Senate races in the country last year into a 21.4-point blowout against a well-funded former governor.

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Senator: Bob Casey (D-Pa.)
Position on Gorsuch: He has said will vote “no” and support a filibuster.
Last election: He won by 8.7 percentage points.
2016 results: Trump won by .7 points.
Why he should fear: Casey won his re-election by a healthy margin, but it was tighter than his 17-point victory over then-Sen. Rick Santorum in 2006. And Pennsylvania has been trending Republican in recent years. The GOP controls both houses of the legislature, Sen Pat Toomey (R-Pa.) won re-election last year, and Trump became the first Republican since George H.W. Bush to carry the state in a presidential election. Casey is another Democrat who stresses moderate positions on such issues as guns and abortion. A filibuster might not sit well with middle-of-the-road voters.

Senator: Bill Nelson (D-Fla.)
Position on Gorsuch: He has said will vote “no” and support a filibuster.
Last election: He won by 13 percentage points.
2016 results: Trump won by 1.2 points.
Why he should fear: Of all the senators on this list, Nelson probably is the safest. He is more entrenched, having been elected three times. And none of his races have been close, a remarkable feat for Florida. Still, it is Florida. Any statewide office holder should expect a tough fight, and he is the only Democrat in statewide office. He is another Democrat whose self-description as a moderate will be strained by a filibuster.