Former Rep. David Bonior, a one-time leader in Congress who has close ties to labor unions, has signed on to manage a future John Edwards presidential campaign.

Edwards hasn't announced a repeat of his 2004 presidential bid yet, but an Edwards adviser said Thursday that Bonior will run the effort if Edwards decides to run. In the meantime, Bonior has signed on as a senior adviser to Edwards' leadership PAC, the One America Committee.

Bonior represented Detroit's northern suburbs for 26 years in the House, rising to be the No. 2 Democrat before stepping down in 2002 for an unsuccessful campaign for Michigan governor.

Bonior was a leading advocate for labor unions, a constituency that Edwards has aggressively been working to build support since losing the vice presidency as John Kerry's running mate in 2004.

Since leaving Congress, Bonior has been a professor of labor studies at Detroit's Wayne State University and chairman of American Rights at Work, which promotes employees' rights to unionize.