Brian K. Vaughn did his part in keeping 'Under The Dome' in the main TV Universe tonight (albeit unwittingly.)
We learned that the Chinese thought the Dome was some sort of new military weapon and were on the brink of attacking the United States because of it.
According to one resident of Chester's Mill, the President was able to "talk them down off the ledge." Crisis averted.
The President was never named, so we can assume it was Barack Obama, who is the POTUS in both the real world and in Toobworld.