Fivethirtyeight.com has an interesting chart comparing the political climate of 1994 vs. today.
None of this is to suggest that the results that Democrats will encounter any fewer problems in 2010 than they did in 1994. Frankly, it has become easy enough to imagine Democratic losses of the same magnitude as 1994 or even worse. But the less superficial one is in comparing the two cycles, and the more one is willing to uncover root causes, the less similar they seem to be. There's well more than one way to lose a majority.