partisan history of senate - help!

Could someone please point me to a history of the partisan makeup of the Senate? Not the house, the Senate. If someone could, I would…I would…well, I don’t know what I’d do, exactly, but I’d be happy, and wouldn’t do poorly on my essay. And a happy Mr. Excellent is a good thing, right?

http://www.senate.gov/pagelayout/history/one_item_and_teasers/partydiv.htm

Copy and paste if the link doesn’t work.

Thanks, aahala!