State Rep. Krystle Matthews has won the Democratic nomination to challenge Republican U.S. Sen. Tim Scott of South Carolina. Matthews was the second-place finisher in a June 14 primary and defeated author and preservationist Catherine Fleming Bruce in Tuesday's runoff. Matthews said she wants to change a toxic culture she says leads senators and others in power to strip away the rights of minorities and those who are in the most need of protection. Scott has been one of South Carolina's more popular politicians. The Senate's sole Black Republican had no primary opposition and has said this will be his last term if he is reelected.