2006 Realignment? No

By Michael Barone:

"What would a Democratic victory -- likely now but not certain in the House races, possible if all the close ones go their way in the Senate races -- mean? Would it mean that we are heading into a political realignment, to a time when Republican positions can no longer rally a majority?

Not really, I think. Right now, it doesn't look like Democrats will end up with the kind of popular vote percentage in House elections won by their party in 1974 (up from 46 percent to 58 percent in two years) or Republicans in 1994 (up from 46 percent to 52 percent)." More.