A Republican has won a mayoral race in a South Texas Hispanic Democratic bastion, sparking celebration from the GOP nationwide and alarm from some Democrats. Why it matters: Javier Villalobos' victory Saturday in Mexican American-majority McAllen, Texas, comes as some Latino Democrats say their party has been ignoring Mexican Americans in Texas, New Mexico and California as the Republican Party makes dents in areas once solidly blue. Villalobos, an attorney and former chair of the Hidalgo County GOP, beat Veronica Whitacre by about 200 votes in a nonpartisan race where Democrats have dominated for years. His victory drew praise from...