If Kirk loses his re-election bid, it won't be because voters regard him as too moderate but because Democrat Tammy Duckworth succeeds in tying him to his party's presidential nominee — whom Kirk has repudiated. At one time, Donald Trump might have passed as a GOP centrist. But in this campaign, he has exploited themes with a harsh conservative edge — such as building a border wall, massively bombing the Islamic State, renegotiating trade agreements and restoring "law and order."