This year ties the most politically polarized year on record. There is a 76% difference between Repubs and Dems on the Presidents job approval. It ties coincidently with the start of GW Bush's 4th year.
Interesting thing is that it is showing that the country is much more divided over the last decade than normal. Of the past 10 years only one is before Bush and Obama. That is 12 year for Clinton. Now it didn't just start recording as it has Nixon, Ford, Eisenhower, Kennedy, Carter...if you scroll down further.