WASHINGTON – A new poll of Michigan voters released Thursday showed all of the top Democratic presidential candidates leading President Donald Trump in the state.

The poll, released by Quinnipiac University, also showed Democrats leading Trump in Pennsylvania but trailing him in Wisconsin. The three states narrowly backed Trump in 2016, giving him the victory.

It was the first time since 1984 the three states as a bloc had backed a Republican candidate for president and each is considered a battleground in this year's election.

If Michigan and Pennsylvania were to support another candidate in 2020 but Wisconsin voted again for Trump, the president would be narrowly reelected, if every other state and Washington, D.C. voted as they did in 2016.

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In Michigan, the poll found each of the Democrats leading in a head-to-head matchup with Trump, though some were within the 3.4-percentage-point margin of error.

Here is how each of the Democratic candidates polled and their margin versus Trump in the Michigan poll:

Bernie Sanders, 48%-43%

Mike Bloomberg, 47%-42%

Joe Biden, 47%-43%

Elizabeth Warren, 45%-43%

Pete Buttigieg, 45%-44%

Amy Klobuchar, 45%-44%

The poll found similar results in Pennsylvania, though Biden had the biggest margin on Trump, 50-42%, and Sanders at 48%-44%. Bloomberg led Trump there 48%-42%. In Wisconsin, however, it showed Trump leading all the candidates, beating Sanders 50%-43%, Bloomberg 49%-41% and Biden 49%-42%.

Such a wide disparity is notable given that, in 2016, Trump won each by less than 1% of the vote.

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For the Michigan poll, Quinnipiac surveyed 845 registered voters between Feb. 12-18. The partisan breakdown of the poll was 28% self-described Republicans, 31% self-described Democrats and 35% self-described independents.

The poll did not survey voters on their preference among the Democrats in that party's primaries, however. Michigan holds its primary on March 10.

Contact Todd Spangler:tspangler@freepress.com. Follow him on Twitter@tsspangler. Read more onMichigan politics and sign up for ourelections newsletter.