There's the great line: the definition of a liberal is someone who's afraid to take their own side in a fight. And that's my problem with my fellow liberals.
But I think what happened was that Clinton knew how to fight back. And the way he fought back was on the issues - being tough in staying on the things that mattered to people in their lives.
So one important lesson of Vietnam is, the first casualty of an unwise and unjust war are the American troops called on to fight it. Their service should be honored.