If you read only one Atlantic Monthly blogger it should probably be James Fallows, who's got a lot of years on Coates and a lot of sense on Sullivan. (Surely you don't think I can in good conscience recommend the laughable Megan McArdle...)
Fallows's latest is vital, but he wrote almost none of it. No matter! Still vital!
Bipartisanship in the American sense means compromising on legislation so that a sufficient number of members of Congress from BOTH parties will support it, even if (as is typically the case) a few majority party members defect and most minority party members don't join. Bipartisanship consists of getting ENOUGH members of the minority party to join the (incomplete) majority in voting for major legislation. It can't happen if the minority party members vote as a block against major legislation. And that can happen only if the minority party has the ability to discipline its ranks so that none join the majority, which is the unprecedented situation we've got in Congress today.
"The way parliamentary parties maintain their discipline is straightforward. No candidate can run for office using the party label unless the party bestows that label upon him or her. And usually, the party itself and not the candidate raises and controls all the campaign funds. As every political scientist knows, the fact that in the U.S. any candidate can pick his or her own party label without needing anyone else's approval, and can also raise his or her own campaign funds, is why there cannot be and never really has been any sustained party discipline before -- even though it is a feature of parliamentary systems.
"The GOP now maintains party discipline by the equivalent of a parliamentary party's tools: The GOP can effectively deny a candidate the party label (by running a more conservative GOP candidate against him or her), and the GOP can also provide the needed funds to the candidate of the party's choice. And every GOP member of Congress knows it. (Snowe and Collins may be immune, but that's about it.)
Etc., etc., etc. Give it a read.