You're watching a football game and your team is playing a team with a great offense (New Orleans, New England, etc) and a weak defense. You're up by 6 points on the 50. With 4 minutes left to go in the game.
And your coach keeps running it straight up the middle for 3 yards at a time.
You just know that this "playing not to lose" mentality of your idiot coach is going to cost you the game. The other guy has a great offense and you're just going to put him back onto the field.
And you know your team is going to lose.
That's how it feels watching the Romney campaign. Calling Obama a liar is playing defense. Does Romney not know about Fast and Furious? Or Obama's 100 rounds of golf? Of his extreme past?