When Cartman is flying from city to city on Election Day, the screen text shows him to be in Ohio at 5:00pm CST and in Nevada at 3:00pm PST. 5 PM CST and 3 PM PST are the same time. (Not to mention that Ohio has never been on CST.)
When Kyle and Cartman enter Cartman's room, a box marked "Idaho" can be seen in the foreground along with other boxes/containers with various state names. In response to Kyle asking what it all was, Cartman advises that it was "hundreds of thousands votes from all the swing states". Idaho is not considered a "swing state" as the state has been won by a Republican presidential candidate in every election since 1968.
When Cartman lands in Ohio, it says it is 5:00pm CST. But all of Ohio is in the Eastern time zone.