http://www.dcpoliticalreport.com/CurrentPolls.htm
This site has in-depth, state-by-state polling results, including information on Senate, House, and state office holders. Unfortunately, they don't update often enough (most recent Ohio poll is from Sept. '03).
Hopefully, the link I've provided works, and some of the better-trained experts here on opinion polls can provide us with a critique of the results being shown.