Three Democratic senators facing reelection bids in 2018 in states won by President Trump last year are maintaining high approval ratings, according to Morning Consult polling released Tuesday.

Sens. Heidi Heitkamp Mary (Heidi) Kathryn HeitkampCentrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents Susan Collins set to play pivotal role in impeachment drama MORE (D-N.D.), Joe Manchin Joseph (Joe) ManchinTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day MORE (D-W.Va.) and Jon Tester Jonathan (Jon) TesterPence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans Filibuster fight looms if Democrats retake Senate MORE (D-Mont.) saw their approval ratings inch above 50 percent in their respective states in the third quarter of 2017.

Both major parties have expressed optimism heading into the 2018 midterm elections. Democrats are hopeful they can pick up seats in Congress, while Republicans are seeking to pad their majority. Heitkamp, Manchin and Tester are among the Senate seats considered most likely to flip.

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In North Dakota, 55 percent of voters approve of Heitkamp, and 32 percent disapprove. The margin of error in the poll is plus or minus 4 percentage points.

In West Virginia, polling showed Manchin with a 53 percent approval rating, while 36 percent disapprove. The margin of error in that poll is plus or minus 2 percentage points.

While Heitkamp and Manchin saw their approval numbers drop slightly in the third quarter of 2017, Tester saw his rise by 3 percentage points. The latest polling shows 53 percent of voters approve of him, and 33 percent disapprove. The margin of error is plus or minus 4 percentage points.

In all three states, at least half of voters approved of President Trump, according to Morning Consult’s latest polling.

A pair of other Democratic senators facing reelection in 2018 in states that went to Trump in 2016 could be facing longer odds.

Half of those polled approve of Sen. Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (D-Fla.) and only 42 percent approve of Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.).