Here's more evidence that we should expect continued gridlock in the 113th Congress. The progressive (liberal) wing of the Democratic Party has grown in strength and pushed out the more moderate and conservative members of the party who once held seats in Congress.
Here's a link to the story.
Two years ago there were 54 Blue Dog Democrats, now there are 14.
Thus far, researchers have argued that polarization in Congress has been driven primarily by conservative activists in the Republican Party who have driven out the moderate and liberal Republicans from office. That no longer appears to be the sole driver of polarization - so we can safely expect greater conflict in the next two years.
The big winner in the Congressional election appears to be the Progressive Change Campaign Committee which has pushed for the election of ideologically committed progressives.