Remember this: Barack Obama is the guy who mocked Mitt Romney for calling Russia our main geopolitical adversary. Also remember this: For a guy who thinks the '80s are long gone, Obama sure was gung ho to kick-start arms control talks with the Russians. You remember the days when Walter Mondale carped that Ronald Reagan wasn't talking to the Russkies about a new deal to rid the world of the scourge of nuclear weapons? This was a big liberal theme in those days.