As Christian noted, Democrat Tom Barrett is entering Wisconsin’s recall race. Here’s some background on Barrett’s 2010 clash with Scott Walker:

Walker’s primary victory set up a Brew City street-fight for the general-election campaign. He faced off against Democrat Tom Barrett, Milwaukee’s mayor and a former congressman. Barrett, with his silver mane and admiration for John F. Kennedy, cut a sharp contrast to the youthful Reaganite with slick, ink-black hair. While Barrett was in the state assembly during the Reagan era, Walker was running unsuccessful campaigns for student government at Marquette.

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Walker’s record in Milwaukee County came under the microscope. Barrett, who had dealt with Walker for years, hammered the Republican on issues big and small, from the county’s spending levels to how he handled the debt. “Look, the Left tried to attack me for little things we had done here and there,” Walker says. “But in the end, my argument across the state was, hey, if I could take on the political machine in Milwaukee, and win not just at the ballot box but win in how I governed, there was no doubt that I could take on the political machine in Madison.”
As the race began to boil, former House speaker Newt Gingrich, who knows a thing or two about jousting with government workers, became one of his top mentors behind the scenes. They discussed policy and politics over long phone conversations. The Republican Governors Association, sensing a possible pick-up, poured cash into his coffers.
On Election Day, Walker turned 43. He also beat Barrett, taking 52 percent of the vote. Barrett’s support for the stimulus, the foul odor of Obamacare, and Walker’s ability to defend his record, all while championing what he calls “brown bag” conservatism, did him in. “It boiled down to getting Wisconsin working again,” Walker says. “The other part was explaining how I could fix our fiscal mess without hurting our economy and limiting the role of government.”