Then: political protest (during time of war, on foreign soil, heartening enemies and demoralizing troops) is patriotic
Now: political protest (on American soil, of attempted tyranny) is done only by mobs, and is Nazi-like
Then: if some protestors have political connections, the whole is invalid
Now: hey look! An innocent, randomly-chosen cute little kid who just happens to like The One and feel pouty about all those mean signs!
Except maybe not so much.
UPDATE: here's another very important then/now.