Rick Santorum indicated that Newt Gingrich should drop out of the presidential race, arguing -- as Gingrich did during his surge -- that splitting the "anti-Romney" vote helped Mitt Romney win the Michigan primary and Washington caucuses and contributes to his overall success so far. "It's always harder when you've got to conservative running in the race as we have seen in Washington and we've seen in other states," Santorum said on Fox News Sunday. "We have the anti-Romney vote, if you will. Both Gingrich and I are slugging away." Santorum stopped short of calling for Gingrich to exit the...