On Morning Joe today, Mika Brzezinski asked Tim Pawlenty to assess the strength of one of his potential rivals, Donald Trump, and the former Minnesota governor tried at first to remain positive, calling Trump “talented” and “interesting.” When it came time to assess Trump’s apparent platform of birth certificates, Pawlenty was decidedly less positive: Tim Pawlenty says Donald Trump needs to get off the birther circuit. In an interview on MSNBC’s Morning Joe, the former Minnesota governor said there are more serious concerns to weigh. “I, for one, do not believe we should be raising that issue,” Pawlenty said. “I...