Lowell Weicker served three terms in the U.S. Senate from Connecticut as a Republican, before being defeated by then-Democrat Joe Lieberman—with an assist from influential conservatives—in 1988. Two years later, in a rare feat, he won Connecticut’s gubernatorial election as a third-party candidate. In a Friday interview, Weicker—now 82—slammed the modern GOP, scorched his old foe Lieberman, and urged an upheaval in how America funds public schools. …I think that if the Republican Party stays as it is now, I would still run as an independent, as I did when I ran for governor. The problem would be that if...