National Journal: “For all the many complications a contested convention could cause for the Republican Party, it would create a very specific quandary for the presidential candidates—how to pick a running mate. If Donald Trump, Ted Cruz, or John Kasich select a vice president before the GOP gathers in Cleveland, they lose the ability to use the post as a bargaining chip to secure the nomination. But if they wait until the convention is underway, they risk making a hasty—and potentially unvetted—pick.”

