This article by one of my favorite political bloggers basically talks about why, with the possibility of the left getting back into the White House, there are suddenly calls for bi-partisanship and the like. Where were these calls during the last 7 years, etc.
It's a good topic and an important point, and it should be kept in mind going forward. Partisanship is good and healthy when practiced in good faith. Bi-partisanship for the sake of being bi-partisan is much more damaging. The entire point of having different parties and partisans is because people just DO NOT AGREE on certain key issues. Deal with it.