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Politicians do what they must to get re-elected. So it’s not unexpected that Republican senators like Richard Lugar and Orrin Hatch would swing sharply to the right to fend off primary challengers...

Still, it is worth pointing out that this behavior is not entirely honorable. It’s not honorable to adjust your true nature in order to win re-election. It’s not honorable to kowtow to the extremes so you can preserve your political career.

But, of course, this is exactly what has been happening in the Republican Party for the past half century. Over these decades, one pattern has been constant: Wingers fight to take over the party, mainstream Republicans bob and weave to keep their seats.

Republicans on the extreme ferociously attack their fellow party members. Those in the middle backpedal to avoid conflict. Republicans on the extreme are willing to lose elections in order to promote their principles. Those in the mainstream are quick to fudge their principles if it will help them get a short-term win...

These days the fight is between the protesters and the professionals. The grass-roots protesters in the Tea Party and elsewhere have certain policy ideas, but they are not that different from the Republicans in the “establishment.”

The big difference is that the protesters don’t believe in governance. They have zero tolerance for the compromises needed to get legislation passed. They don’t believe in trimming and coalition building. For them, politics is more about earning respect and making a statement than it is about enacting legislation. It’s grievance politics, identity politics.

Of course, the professional politicians don’t want to get in the way of this torrent of passion and resentment. In private, they bemoan where the party is headed; in public they do nothing...

The wingers call their Republican opponents RINOs, or Republican In Name Only. But that’s an insult to the rhino, which is a tough, noble beast. If RINOs were like rhinos, they’d stand up to those who seek to destroy them. Actually, what the country needs is some real Rhino Republicans. But the professional Republicans never do that. They’re not rhinos. They’re Opossum Republicans. They tremble for a few seconds then slip into an involuntary coma every time they’re challenged aggressively from the right.

Without real opposition, the wingers go from strength to strength. Under their influence, we’ve had a primary campaign that isn’t really an argument about issues. It’s a series of heresy trials in which each of the candidates accuse the others of tribal impurity...

Before the G.O.P. meshugana campaign, independents were leaning toward the G.O.P. But, in the latest Politico/George Washington University Battleground Poll, Obama leads Mitt Romney among independents by 49 percent to 27 percent.

Leaders of a party are supposed to educate the party, to police against its worst indulgences, to guard against insular information loops. They’re supposed to define a creed and establish boundaries. Republican leaders haven’t done that. Now the old pious cliché applies:

First they went after the Rockefeller Republicans, but I was not a Rockefeller Republican. Then they went after the compassionate conservatives, but I was not a compassionate conservative. Then they went after the mainstream conservatives, and there was no one left to speak for me.

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The big difference is that the protesters don’t believe in governance. They have zero tolerance for the compromises needed to get legislation passed. They don’t believe in trimming and coalition building. For them, politics is more about earning respect and making a statement than it is about enacting legislation. It’s grievance politics, identity politics.

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Of course, the professional politicians don’t want to get in the way of this torrent of passion and resentment. In private, they bemoan where the party is headed; in public they do nothing...