Gov. Gretchen Whitmer says she’s endorsing Joe Biden for president and will be joining his campaign as one of four national co-chairs.

The Democratic governor made the announcement on Twitter and on MSNBC’s Morning Joe talk show.

“We need a president who will show up and fight for Michiganders,” Whitmer said on Twitter. Biden “has proven time and again that he has our back. I am proud to both endorse him and announce that I will be joining his campaign as a co-chair.”

We need a president who will show up and fight for Michiganders, and @JoeBiden has proven time and again that he has our back. I am proud to both endorse him and announce that I will be joining his campaign as a co-chair. pic.twitter.com/Vs5J4Ik09F — Gretchen Whitmer (@gretchenwhitmer) March 5, 2020

She expanded on that statement in a press release.

Biden “had all of our backs when he worked with President Obama to expand health care to millions of people under the Affordable Care Act, including 680,000 Michiganders who now have coverage through Medicaid expansion,” she said in the press release. “He had our backs during the auto industry rescue that saved GM and Chrysler. And he’s proven that he will continue to fight for those values and more as our next president.

“Joe Biden is the candidate we need to defeat Donald Trump in November," she said. "He’s always had our backs. Now, I’m proud to have his.”

The press release said that Whitmer joins Delaware Congresswoman Lisa Blunt Rochester, Louisiana Congressman Cedric Richmond and Los Angeles Mayor Eric Garcetti as national campaign co-chairs, serving as a top advisor and surrogate for Biden.

Whitmer earlier said that she was unlikely to endorse a candidate before Michigan’s March 10 primary. But Wednesday, Whitmer told reporters “a lot of things have changed in the last 72 hours."

Whitmer added that she is interested in leadership that’s “focused on the fundamentals.”

Last month, Whitmer told MLive every leading Democratic presidential hopeful had called her for advice on how to win Michigan, and said she encouraged all of the candidates to visit Michigan and listen to voters’ concerns.

As of Thursday morning, four Democratic candidates remain in the race: former Vice President Joe Biden, U.S. Sen. Bernie Sanders, U.S. Sen. Elizabeth Warren and U.S. Rep. Tulsi Gabbard.

Biden’s prospects of securing the nomination were in doubt after losing the first three primary states, but he decisively won South Carolina last weekend, kicking off a comeback tour that produced victories in nine of 14 states voting on Super Tuesday.

Biden’s resurgence reshapes the dynamics of Michigan’s primary, where Sanders had been expected to secure a repeat of his 2016 primary victory.

Wednesday, former New York City Mayor Mike Bloomberg dropped out of the race and endorsed Biden.