Which political party was in control of the US Senate in 2007?

As of January 3, 2007, the Democrats took control of the US Senate. While the count was actually 49-49, there were two so-called "independents." Senator Bernie Sanders of Vermont, officially an independent, had always caucused with the Democrats, and he cast the deciding vote that put Nevada Sen. Harry Reid in place as the Senate Majority Leader. (Sanders, while officially an independent, describes himself as a "democratic socialist.") Sen. Joe Liebermann, from Connecticut, likewise votes most often with the Democrats, but did not provide a decisive vote in the division of the Senate in 2007.