Bill Brock, a former Tennessee senator and Republican chairman who rebuilt the party after the Watergate scandal, has died at age of 90.Family friend Tom Griscom says Brock died on Thursday morning.Brock was an official with his family’s Brock Candy Co. before he was elected to the House of Representatives in 1962.His work to improve fundraising and broaden membership helped Ronald Reagan beat President Jimmy Carter in 1980. BRock a;lso served in the Reagan Administration as Labor Secretary.