I am guessing that Florida, North Carolina, Ohio, and Virginia are about the political average. All in all, a 49-49 split of the popular vote is an even split, and a state close to the national average is a pure tossup.
Not quite.
In NC in '08, for example:
Obama: 49.7%
McCain: 49.4%
Barr: .6%
Arguably, Barr was a spoiler candidate who allowed Obama to win. So in a close national race, those candidates who take a small percent of the vote can actually be pivotal.
NC gave more than 50% of its vote to the ''not Obama'' crowd. But that little split allowed Obama to walk away with it.