Wisconsin Democrats pick mayor to challenge governor from Reuters: Politics MILWAUKEE (Reuters) - Wisconsin Democratic primary voters on Tuesday picked Milwaukee Mayor Tom Barrett to face controversial Republican Governor Scott Walker in a recall election next month, a test of labor union strength in a battleground state before the November general elections. feeds.reuters.com/~r/Reuters/PoliticsNews/~3/advAnV9WyAo/us-usa-politics-wisconsin-winner-idUSBRE84803A20120509