海角大神

Look through the microscope of the just-passed Bipartisan Budget Act, and you鈥檒l see that Republicans in both the Senate and House darted about like protozoa.

A handful of Republican senators who might have normally supported this modest two-year compromise voted against the bill that averts a much-feared government shutdown. In the House, about half the tea party caucus 鈥� who normally reject compromise 鈥� backed it.

The switcheroo makes it look like the House and Senate are trading places 鈥� with the House taking on some of the more 鈥渕oderate鈥� characteristics of the Senate, and the Senate taking on more of the partisan characteristics of the House.

鈥淚 think there鈥檚 some evidence that the two chambers are less distinct,鈥� says Amy Black, political scientist at Wheaton College in Illinois.

On the Senate side, that change is visible in the greater influence of the tea party, including the outsized role that freshmen tea party Sens. Ted Cruz (R) of Texas and Mike Lee (R) of Utah played in forcing October鈥檚 government shutdown. On Wednesday, all eight senators that identify with the tea party except one, Ron Johnson (R) of Wisconsin, voted 鈥渘o鈥� on the budget deal, which passed the Senate, 64 to 36.听

听More noteworthy: Senate听Republicans who have been known to work across the aisle might have supported this bill had it not been for the fact that they all face primary challenges next year that test their conservative credentials. Those senators include Lamar Alexander of Tennessee, Thad Cochran of Mississippi, Mike Enzi of Wyoming, Lindsey Graham of South Carolina, Pat Roberts of Kansas, and even minority leader Mitch McConnell of Kentucky.

Each argued vigorously against parts of the budget deal he didn鈥檛 like 鈥� including changes to military retirement pay and busting current budget caps. But each has also backed 鈥渋mperfect鈥� legislation in the past and nothing鈥檚 to say a problematic provision can鈥檛 be reviewed in the future.

Another sign of increasing House-like partisanship in the Senate: the intensified fight over minority-party rights. The minority has basically no rights in the House. Almost everything is done by majority rule and a Rules Committee does leadership鈥檚 bidding in limiting amendments and debate in order to make more workable a body of 435 members who directly represent districts all over the country. The tradition of the Senate, whose 100 members serve statewide constituencies that are far more diverse, is more deliberate and slow, with rules that often require a supermajority or unanimous consent听to proceed.

When Democrats recently did away with the 60-vote threshold to end debate on most presidential nominees 鈥� a pausing and blocking device available to any senator 鈥� Republicans retaliated through other procedural means. Last week, the Senate was forced into all-night sessions as business slowed to a crawl.

鈥淚f we were to see continued changes to Senate rules that made more and more simple-majority politics, we would see it become more partisan like the House, and we would see less of an ability of Democrats and Republicans to work together,鈥� says Professor Black.

But here's a surprise. The House last week saw far less partisanship than usual. Uncharacteristically, a majority of Republicans voted with Democrats in favor of the budget agreement. Not only that, of the 48 representatives identifying themselves as members of the tea party, only 23 kept in line with that caucus to vote against the deal. That鈥檚 a significant shift for a group that marches in formation.

The bipartisan budget deal reflects 鈥渓essons learned,鈥� as Speaker John Boehner (R) of Ohio explained on the morning of the vote 鈥� painful lessons such as the plummet in GOP approval ratings after the government shutdown in October. And it reflects a readiness to 鈥渢ry to make divided government work,鈥� as House budget meister Paul Ryan (R) of Wisconsin said last week.

But such shifts in institutional character are changes of degree. With a third of the Senate and all of the House facing voters in November, lawmakers are closely tracking the response back home. The mere prospect of a credible primary challenge often fires up deep partisanship.

Julian Zelizer, a congressional historian at Princeton University, cautions that Congress may have passed a bipartisan budget deal, but it comes after a 鈥渉uge train wreck.鈥澨齌hat context is important to remember, he says. Congress isn鈥檛 trying to solve big issues like entitlement reform. It is simply avoiding another train wreck. 鈥淭he question is, can Congress make deals without crises like this."