A Duel, but Not Decisive

[gilliam]

I saw this today, and I thought it would come in handy to compare with what happens Tuesday night.

Since the end of World War II, the average loss for a second-term presidency in its sixth year has been 29 House seats and six Senate seats. If you go back to Franklin Roosevelt’s second term, the House loss average jumps to 35. Thus a 25/6 House/Senate loss would be about (and slightly below) the historical average.
realclearpolitics.com/articles/2006/11/a_democratic_victory_would_be.html