So this is why John McCain has been running around to every TV camera he can find to say that we need to convene a 'Watergate' type select committee on Benghazi.John McCain's Benghazi Committee Plan Would Give Senator New RelevanceWASHINGTON -- Just four years ago, John McCain was the leader of the GOP. Today, he's the highest-ranking Republican on the Senate Armed Services Committee, a perch from which the former fighter pilot is deeply engaged in the national conversation over war, terrorism and intelligence gathering.But in January, the Arizona senator will lose his top-ranking committee seat due to term limits. The only ranking Republican spot available to him next session will be on the Indian Affairs Committee.Unless, that is, the Senate creates a brand-new select committee. On Wednesday, McCain, flanked by Sens. Lindsey Graham (R-S.C.) and Kelly Ayotte (R-N.H.), proposed just that: a select committee with extensive authority to investigate the Benghazi, Libya, attack and the U.S. government's response. The Republican most likely to hold the ranking spot on such a panel would be, of course, John McCain, giving the Arizona senator a new burst of relevance.