Some of them, anyway. Donald Trump has endorsed candidates in 15 Senate contests to date, according to Politico. Many of them are incumbent Senators. They are expected to cruise to renomination by the GOP. But, says Politico, some of the others are struggling. Politico cites Mo Brooks in Alabama, Kelly Tshibaka in Alaska, Ted Budd in North Carolina, and Sean Parnell in Pennsylvania (Parnell recently withdrew from the race due to allegations of spousal abuse). Trump hasn’t endorsed Blake Masters, but did appear at a Mar-a-Logo fundraiser for the Arizona Republican. Masters is also struggling, according to Politico. I don’t...