This story is a sequel to Derpy Intentionally A Portal Gun
Or, Derpy Accidentally a Presidential Campaign
Due to a rather strange clause in electoral process added by Thomas Jefferson, ponies turn out to actually be a large voting bloc in the American Presidential primary.
Upon discovering Equestria, the current candidates begin campaigning in Equestria.
It doesn't go as well as you'd expect.
This is the worst thing I have ever read
--Theodore Roosevelt