Jeb Bush and Ted Cruz Have the Most to Lose in South Carolina

It is not yet clear which Republican presidential candidate will emerge from Saturday’s South Carolina primary with the biggest boost. But it is becoming increasingly apparent which two would suffer most from a disappointing performance.

South Carolina will render a brutal and perhaps final verdict on Jeb Bush’s campaign if he does not at least finish close to Senator Marco Rubio of Florida. Mr. Bush, the former Florida governor, has made an all-out push here, campaigning ag