Last month, Mitt Romney called Russia America's number one geopolitical foe, sparking people to ask if such a thing really existed. It sounded like Romney was trying to bring back the Cold War or his understanding of foreign policy hasn’t evolved since then.
The number one geopolitical challenge to the United States right now is the sour, partisan, retrograde politics in Washington itself. The United States remains by far the most influential country in the world, but this position is ours to lose. The key is for our country to stay true to its core values of education, openness, and liberty. The pursuit of happiness is also an American virtue that underscores the fact that perfecting our country will always be an unfinished project. But when America innovates and embraces education, it can’t be beat. When America promotes a free and open playing field, it’s second to none. The longer-term constraint on U.S. foreign policy choices will be the dual challenge of U.S. debt and accommodating views from emerging powers.
That means the United States needs to get its fiscal house in order and work to update the rickety institutions of global governance. But that doesn’t point to a clear external strategic foe.
Zbigniew Bzezinski seems to agree: http://www.saisreview.org/2012/04/04/574/