Oh goody. He's quite the conservative hero, now that he's broken the backs of Wisconsin union: Wisconsin Gov. Scott Walker, whose speech to activists in Iowa last weekend drew strong reviews, has taken the first formal step toward a presidential candidacy in 2 16, establishing a committee that will help spread his message and underwrite his activities as he seeks to build his political and fundraising networks in the months ahead. Walker filed papers to set up the committee, called "Our American Revival," and a new Web site for the organization was scheduled to go live later Tuesday.