The House Ethics Committee announced Monday that it is looking into allegations Rep. Nancy Mace (R-S.C.) over-billed her congressional office for funds to maintain her home in D.C. Why it matters: The charges, which Mace's lawyer called "fundamentally flawed," could add further mayhem to her bid for governor of South Carolina.Mace has built a national profile for making heated public statements and picking fights with both political rivals and other individuals who she says have wronged her.Last...