The exit of Rick Santorum from the Republican presidential primary essentially clears the path Mitt Romney is traveling to become the party's nominee against U.S. President Obama in November but Romney still has to win the hearts of GOP voters as well as the party's nomination. Romney had 573 delegates per the Republican National Committee's count to Santorum's 202 delegates when the former U.S. senator from Pennsylvania withdrew last week. But he has yet to stir a fire in the belly of the party's evangelical and conservative wings as he moves closer to the 1,144 delegates needed to claim the...