An update:
A good early bet is for the margins of control to narrow in both houses of Congress. Republicans should win the House of Representatives again, but Democrats will pick up some seats, maybe cutting the GOP majority of 25 by a third or (only if Obama wins handily) by as much as half. The Senate appears likely to be very narrowly divided, with Democrats holding on by a seat or, more likely, Republicans gaining technical control by a seat or two.
The Dish 