A Democrat, Kreitlow was a member of the Wisconsin State Senate, representing Wisconsin's 23rd Senate district, from 2007 to 2011. In November 2008, Kreitlow was elected President pro tempore of the Wisconsin State Senate.
Kreitlow, identified as a Democrat, served in the Wisconsin State Senate for the 23rd district from 2007 to 2011. In November 2008, he was elected to serve as President pro tempore of the Wisconsin State Senate.