Fearful of a third successive Democratic triumph, concerned Senate Republicans are turning against 2016 presidential bids by upstart hopefuls within their own ranks. In forceful comments to The Hill, GOP senators made it plain that they would much prefer their party nominate a current or former governor over Sens. Ted Cruz (Texas), Marco Rubio (Fla.) or Rand Paul (Ky.). Those senators have created a buzz among conservative activists, but their colleagues in the upper chamber are eager to support a nominee from outside Washington with a record of attracting independents and centrist Democrats. They worry that Washington has become so...