Planet Newt may still be the center of the Gingrich universe, but the former speaker of the House knows his presidential stars aren’t aligned this election cycle. On Sunday, Gingrich told Fox News that “you have to be realistic” about the way the GOP race will turn out, saying that rival Mitt Romney “is far and away the most likely Republican nominee.” Running for president is “much harder than I thought it would be” he said. Newt will plug on, though, and asked whether or not he thought Rick Santorum should drop out of the race, Gingrich said the decision is Santorum’s alone.