In the first Rasmussen polling taken primarily after Rick Santorum’s hat trick on Tuesday night, Santorum is faring 6 points better than Mitt Romney in their respective matchups versus President Obama.  Rasmussen’s polling of likely voters nationally (conducted from Tuesday through Thursday) now shows Obama leading Santorum by 4 percentage points (46 to 42 percent), while Obama leads Romney by 10 points (50 to 40 percent).