Sanders vs. Clinton: Who's qualified to be president?

(CNN)Many uncomplimentary things have been said about Hillary Clinton during this presidential campaign, but until now no one has said she isn't qualified to hold the presidency. Indeed, love her or hate her, it's hard to think of a candidate in recent history with more qualifications than she has. But that's what Bernie Sanders is now saying as the primary contest between the two gets decidedly less friendly, which should lead us all to ask just what constitutes a qualification for the most important job on Earth. This all began when Sanders gave an interview to the New York Daily News, in which, his critics say, he failed to display a depth of knowledge on issues, even some that are at the...