From The Washington Post:
The most striking thing about the current Republican vice presidential field is its striking superiority to the Republican presidential field of six months ago. Former Florida governor Jeb Bush, Sen. Marco Rubio, New Jersey Gov. Chris Christie and Sen. Rob Portman are among the more accomplished, knowledgeable, ideologically balanced political figures in American politics. The same could not be said of Rick Perry, Herman Cain or Michele Bachmann.
The untested, of course, are also unwounded. It is easier to appear qualified and dignified when you haven’t been stripped, prodded with sharp sticks and forced to perform tricks on dozens of debate stages.