You know, aside from being symbolic, it's not actually very meaningful in reality - as debt and GDP are measuring two different sorts of things (like for a start GDP ≠ the value of a nation's assets).
Trying to worry about reducing the deficit at this particular point in time would be suicidal; especially when you are the US and you have historically low interest rates helping you along.
Exactly. I would not worry about debt at this point in time. Indeed it is highly preferable to be running a substantial deficit.