Buried deep in this column by Charlie Cook:
Polling focusing on the undecided voters reveals they are a deeply pessimistic and angry segment of the electorate and don’t particularly like either candidate (fitting, because they don’t tend to like politicians). But they show signs of being more conservative than not. One unpublished analysis gives Republicans a 10-point advantage on the generic congressional ballot test among those undecided about the presidential race. Close analysis of the numbers shows that Obama might have an edge with between a third and a quarter of the currently undecided bloc. That’s cutting things awfully close.
My one caveat to this finding: A good portion of the remaining undecided are the notorious “low-information voters,” whose views seem particularly fickle and easily swayed. While the instincts of these voters are conservative, they probably shouldn’t be thought of as actually conservative voters.