And then there were three.
The 59-year-old made the announcement at the Marriott Hotel on Michigan Avenue.
In a welcome video posted on his campaign Web site, scanlan admits to being a political newcomer, but cites the arrest and impeachment of former Gov. Rod Blagojevich for sparking his interest.
"I'm running for governor because I think it's time our state begins working for us," Scanlan said.
Scanlan's platform focuses on reforming the state's pension program.
"Currently we have the highest unfunded pension liabilities of any state in the country," he said, recommending that instead of a pension, state and local government employees should be able to participate in a program similar to a 401(k).
"This alone would save our state billions of dollars per year," he said.
Scanlan faces incumbent Gov. Pat Quinn and Comptroller Dan Hynes in the Feb. 2, 2010 Democratic primary. He said he doesn't plan to finance the race with his own money and is instead hoping to get support from donors.
Scanlan acknowledged that he’s "headed into some stiff headwind" and that his campaign would be "stepping on some very powerful toes," the Chicago Tribune reported.
On his Web site, Scanlan's son said he learned of his father's plans about two weeks ago.