story on party politics

Here is a link to an AP story about the history of partisan politics. Pretty good read.
Seems like the current nastiness isnt all that new.
 Here is a quote from the story
The Congressional Quarterly, which tracks voting trends, says that in 2009 both House and Senate Democrats voted with their party 91 percent of the time on votes where the two parties were at odds. That was at or near record levels of unity for both. House and Senate Republicans were nearly as unified.