The stream of down-ballot Republicans breaking with the Trump campaign over Mr. Trump's past vulgar language has now been capped by the notice from House speaker Paul Ryan (R-Wis.) that "he will not defend or appear with" Mr. Trump, and that "rank-and-file" Republicans are on their own "to do what's best" in their districts. Ryan's counterpart in the Senate, Majority Leader Mitch McConnell (R-Ky.), for his part, is giving the presidential campaign controversy the silent treatment: "I don't have any observations about it." But The Hill observes: More than a dozen senators have either rescinded their support of the GOP...