Former vice president Joe Biden and Sen. Bernie Sanders (I-Vt.) both lead President Trump by 12 points in a new poll of likely Michigan voters. (Michelle Gustafson/Bloomberg News, Mandel Ngan/AFP/Getty Images)

A new poll shows both Democratic White House hopefuls Joe Biden and Bernie Sanders with substantial leads in matchups with President Trump in Michigan, one of the Rust Belt states key to his 2016 electoral college victory.

Biden, the former vice president, and Sanders, a senator from Vermont, led Trump by identical margins — 53 percent to 41 percent — among likely voters in the poll conducted for the Detroit News and the Detroit television station WDIV-TV.

South Bend, Ind., Mayor Pete Buttigieg also led Trump in a hypothetical matchup by a smaller margin of 6 percentage points. Two other Democrats — Sens. Kamala D. Harris (Calif.) and Elizabeth Warren (Mass.) had leads that were within the poll’s margin of error.

In 2016, Trump defeated Democrat Hillary Clinton in Michigan by less than a quarter of a percentage point, picking up the state’s 16 electoral votes. Trump was the first Republican presidential candidate to carry Michigan since George H.W. Bush in 1988.

In an interview last month, Trump campaign manager Brad Parscale cited Michigan as a state key to the president’s 2020 prospects.

“Obviously, we have to go back and win Michigan again, Pennsylvania, Wisconsin,” Parscale told CBS News’s “Face the Nation,” referring to three states that Trump won by a combined 78,000 votes in 2016.

Parscale also pointed to several states won by Clinton that he predicted could be in play next year, including Minnesota, New Mexico, New Hampshire, Nevada and Colorado.

The new poll out of Michigan, conducted by the Glengariff Group from May 28 to 30, has a margin of error of plus or minus 4 percentage points.