I once wrote about lobbying, and this week I called some Republicans I used to talk to (and some that they recommended I talk to) about the effect the shutdown is having on the Republican Party in Washington. The response I got was fear of Republican decline and loathing of the Tea Party: One lobbyist and former Hill staffer lamented the “fall of the national party,” another the rise of “suburban revolutionaries,” and another of “people alienated from business, from everything.” There is a growing fear among Washington Republicans that the party, which has lost two national elections in a row, is headed for history’s dustbin. And I believe that they are right to worry.

The battle over the shutdown has highlighted the cracks and fissures within the party. The party’s leadership has begun to lose control of its members in Congress. The party’s base has become increasingly shrill and is almost as dissatisfied with the Republican leadership in Washington as it is with President Obama. New conservative groups have echoed, and taken advantage of, this sentiment by targeting Republicans identified with the leadership for defeat. And a growing group of Republican politicians, who owe their election to these groups, has carried the battle into the halls of Congress. That is spelling doom for the Republican coalition that has kept the party afloat for the last two decades.

More: GOP Death Watch: The Final Days of the Republican Party