Which brings to mind the one person who is largely missing from the bursting out of bipartisanship: President Obama. All these recent bipartisan agreements have been reached with little or no involvement by him. They were forged by knowledgeable members of Congress skillful at bridging differences with colleagues across the aisle.
As Senate majority leader, Harry Reid blocked bipartisan measures, and Obama has shown neither the inclination nor the capacity to advance them. But with McConnell opening up the Senate floor for votes and amendments, agreements are now possible.
Bipartisanship is not necessarily a good thing. Strong partisans often dislike the results, and some bipartisan compromises are bad policy. But like it or not, bipartisanship is suddenly busting out all over.