Although he served on Capitol Hill for four years in the U.S. House and 12 years in the U.S. Senate through 2006, Rick Santorum – like his former colleague Newt Gingrich – isn’t exactly having a difficult time keeping track of his endorsements from current members of Congress. As of the end of Tuesday evening, Santorum had won more state primaries and caucuses (four: Iowa, Minnesota, Missouri, Colorado) than endorsements from sitting members of the U.S. House and Senate (three). The only members of Congress to endorse Santorum thus far are Republican U.S. Representatives from his home state of Pennsylvania: Glenn Thompson (PA-05), Tom Marino (PA-10), and Lou Barletta (PA-11).