If you’re a South Carolina Republican who doesn’t like Sen. Lindsey Graham, you’ve got a problem. Graham is popular. Really popular. His approval rating among the state’s Republicans hovers in the 60-70 percent range. Those aren’t the kinds of numbers that typically foretell successful primary challenges. But as The National Review’s Betsy Woodruff reports, “the people that don’t like him really, really, really don’t like him. There are typically a lot of those people at the state convention.” And those people came up with a great idea: What if the South Carolina Republican Party chose its nominees at the state...