Former Vice Adm. Joe Sestak has more than enough qualifications to discuss the government shutdown on a cable news network: He served two terms in the House of Representatives, representing a suburban Philadelphia district. He ran for Senate in 2010 and might run again in 2016. He spent more than three decades in the Navy, serving as the deputy chief of naval operations for warfare requirements and programs before being removed from that post by newly minted Chief of Naval Operations Adm. Mike Mullen in 2005. He’s got a pulse (Seriously, cable will talk to anybody). Sestak’s Wednesday appearance on…