I've heard more about the Logan Act from armchair political science scholars in my Facebook feed in two days than I heard in actual political science classes.
This is all because, apparently, a bunch of Senators who wrote a letter confirming that the Obama Administration couldn't unilaterly approve a nuclear technology treaty with Iran without first consulting Congress. Suddenly, they're "siding with hardliners" (as though there is anything but in Iran) and undermining the authority of the President (to do, what, exactly?), even though John Kerry himself admits that nothing hammered out with Iran is final or legally biding. As fantastic as the letter has been for Obama's standup comedy career, it does drive home the point that any agreement reached is temporary, at best.