Did Petraeus and Clinton risk spilling bigger secrets than Snowden?

Edward Snowden, Hillary Clinton, and David Petraeus each mishandled classified information while working for the federal government in recent years, but the three face wildly divergent futures as US President-elect Donald Trump prepares for his transition into the White House. Mr. Snowden, a fugitive, is resisting felony charges. Mrs. Clinton, defeated in last month's presidential race, avoided prosecution.