Bet they didn't think one party having control of both side of Congress and the White House was a problem when Democrats did it, like they did from 1961-1969, 1977-1981, and 1993-1995 (using the dates when the actual switchover took place).

From the article:

"In an eleventh-hour appeal, Democratic leaders are telling voters it would be disastrous to let the Republicans win control of both House and Senate, as well as the White House. Even discounting some campaign hyperbole, House Democratic Leader Dick Gephardt does appear to think a GOP sweep in next Tuesday’s elections is a real possibility. Democrats were not making this argument even two weeks ago."