In 2012 there will be a US presidential election using a new distribution of the electoral college. This will use the population data of the current US census. After last night’s elections, there has been a dramatic change in what happens if the Democrat and Republican candidates end up with a tie (for example 269 votes each).
Short answer is that, assuming the politicians stick to their party, the Republicans win the presidency, but the Senate would pick a Democrat for Vice President. Details at my election blog.
[Update: correction made from comments, thanks Lone Ranger!]