After Chance appears on a tv show, the president is so restless that he has no desire for sex. This happens at least once more in the movie, and I wonder what the issue is. Maybe he's already concerned the now-popular Chance would defeat him in a possible future contest (for U.S. presidency)? If so, are we given enough detail in the movie to justify him acting this way?
The only two explanations I have for the President's apparent impotence are: