Former Michigan Democratic congressman Mark Schauer has filed paperwork to run for governor in 2014, he announced Tuesday, giving Democrats a credible contender against vulnerable Gov. Rick Snyder (R).

"I wanted to let you know that I just filed the paperwork to become a candidate for governor," Schauer wrote supporters in a e-mail. "I’m ready to run, I’m ready to work, and I’m ready to win in 2014. And I hope you’ll stand with me."

Schauer's decision is not a surprise. Democrats have been wooing him to challenge Snyder, and other potential candidates have expressed support for him publicly. What it all means is that Schauer is likely to have a clear path to  the Democratic nomination.

Snyder looks to be facing a tough reelection bid, polls show. After running as "one tough nerd" in 2010, the Republican has opened himself up to attacks from the political left after signing legislation turning Michigan into a "right to work" state over the protest of organized labor.

Schauer served one term in Congress before being unseated in 2010. He was a state legislator before that.

"Voters have rejected Schauer’s out-of-touch agenda before and will do so again in 2014," said Republican Governors Association Executive Director Phil Cox in a statement.

Updated at 4:49 p.m.