US election day could bring historic split

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The question around Washington today is not whether Nov. 2 will be a difficult day for the Democrats who control Congress, but rather how bad it will be, according to Washington Post.
Increasingly, it looks like the answer depends on which chamber of Congress you're following.
The nonpartisan Cook Political Report now estimates that more than 90 Democratic House seats are potentially in play; on the Republican side of the aisle, it estimates that only nine appear in jeopardy. As a result, most leading forecasters say it is more likely that Republicans will win the 39 House seats they need to take control.
On the Senate side, however, the battle has narrowed to a handful of true nail-biters in Nevada, Pennsylvania, Illinois and Colorado - all of which are likely to stay close to the end.
It would take a sweep of nearly all of them, improbable but not impossible, for the Republicans to pick up the 10 seats they need to gain control of the chamber. At this point, it's possible that Democrats will end up losing only three or four seats, and they will count that as a good night.
If these trends hold - if the Republicans do gain the House without also taking control of the Senate - that would represent a historic anomaly: Not since the election of 1930 has the House changed hands without the Senate following suit.