

[ politics / usa senate balance northeast 2006.png ]
[ politics / usa senate balance south 2006.png ]
number of seats held in northeast
number of seats held in south
blue - democratic
red - republican
northeast - CT, DE, ME, MD, MA, NH, NJ, NY, PA, RI, VT
south - AL, AR, FL, GA, KY, LA, MS, NC, SC, TN, TX, VA
(intra-election changes are accumulated)
source: wikipedia.org