The Ninety-Ninth Wisconsin Legislature convened from January 5, 2009, through January 3, 2011, in regular session, though it adjourned for legislative activity on May 26, 2010. The legislature also held two special sessions and four extraordinary sessions during this legislative term.[1][2]
This session represented the first time the Democratic Party of Wisconsin held full control of state government since 1986.
Senators representing even-numbered districts were newly elected for this session and were serving the first two years of a four-year term. Assembly members were elected to a two-year term. Assembly members and even-numbered senators were elected in the general election of November 4, 2008. Senators representing odd-numbered districts were serving the third and fourth year of their four-year term, having been elected in the general election held on November 7, 2006.