In another sign that Republicans are uniting behind Mitt Romney with an eye to November, Rick Santorum's national campaign manager has signed on as Romney's deputy national director of coalitions. The Union Leader reports today that the Romney camp reached out to New Hampshire-based activist Mike Biundo not long after Santorum left the race for a post that will involve coalition-building with key conservative coalitions such as "tea party activists, evangelicals, the pro-life community and the Second Amendment community." Santorum has yet to formally endorse Romney, and his camp has been careful to note that a scheduled May 4 meeting...