Tune in to JKUSA tonight at 6pm ET/5pm CT. we'll talk to Maryland Democratic Mayor Martin O'Malley about his endorsement of Governor Walker's opposing candidate, Democrat Tom Barrett.

(CNN) – Wisconsin voters inundated by advertising and door-to-door canvassing began delivering their judgment Tuesday on whether to recall Gov. Scott Walker, a Republican hero for pushing austerity measures that stripped collective bargaining rights from most public unions.

Both Walker and his opponent, Democratic Mayor Tom Barrett of Milwaukee, cast their ballots Tuesday morning in an election expected to hinge on which side does a better job of motivating its supporters to vote.

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