Wisconsin Democrats pick challenger in governor's recall from Reuters: Politics MILWAUKEE (Reuters) - Wisconsin Democratic primary voters went to the polls on Tuesday to pick a challenger to face Republican Scott Walker in a recall election next month, a closely watched test of labor union strength and barometer of political pressures in a battleground state ahead of November elections. feeds.reuters.com/~r/Reuters/PoliticsNews/~3/xbrCFSmadiM/us-usa-politics-wisconsin-idUSBRE84706420120508