The problems of the Democratic Party go way beyond the last 8 years - The Democrats still haven't recovered from RONALD REAGAN winning in 1980, getting his policies through a Democrat congress, and then winning re-election in 1984. It's amazing to see a party this long in stagnation whether its electoral (2007 to 2011 is looking more and more like an anomaly everyday) or its ideological (Clinton largely ceded most of the political ground to the right, while Obama pushed for some things but after the public lashed back in 2010 largely stood backwards).
Yup before Reagan the Dems used to have 270 -280 seats in the house and by the end of the decade he reduced that to Dems being in the 250s.
That reduced their majority enough that another wave election would wipe the dems out and thats exactly what happened in 1994.