Runoff rivals spar over GOP credentials. U.S. House candidate Michael McCaul, whose GOP credentials are under fire from runoff foe Ben Streusand, has picked up the endorsement of one of the state's most popular Republicans. Former President Bush will be a "special guest" at a March 31 McCaul campaign fund-raising reception at a private home in Houston, according to invitations sent out this week. "We are proud in our family to have President Bush as a friend," McCaul said in an invitation letter for the event. "Lowry Mays, my father-in-law and head of the Texas A&M Board of Regents, has...