NBC News Correspondent Ali Vitali explains why former House Speaker Kevin McCarthy (R-Calif.) is supporting Rep. Nancy Mace’s (R-S.C.) challenger in the Republican primary for South Carolina’s first congressional district.us polictics news NBC News Correspondent Ali Vitali explains why former House Speaker Kevin McCarthy (R-Calif.) is supporting Rep. Nancy Mace’s (R-S.C.) challenger in the Republican primary for South Carolina’s first congressional district.