The Santorum campaign appears to be taking a slightly new tack on Newt Gingrich’s continued presence in the race. Instead of calling on Mr. Gingrich to drop out of the race, they called for Mr. Gingrich’s supporters to come to their side. “It’s time for Gingrich supporters to get behind us if they truly want to have a conservative candidate; it’s up to Newt Gingrich to decide what his future is,” John Brabender, Mr. Santorum’s top strategist, told reporters after Mr. Santorum and a crowd of about 200 people had left the hotel ballroom here where Mr. Santorum had conceded...