Weigel counters Goldfarb:

Where does a lot Barr's potential base come from? Embittered white conservatives who will not vote for McCain but could never vote for Obama. Some of these people are racists (or people who put too much faith in the e-mails their cousins forward them); most, hopefully, will be talk radio listeners who consider McCain a quisling on immigration, taxes, free speech, etc and etc. They've spent the primaries casting protest votes for Paul or Huckabee, or putting on Operation Chaos fatigues and voting for Clinton. I'm a huge skeptic about the salience of the immigration issue, but with a Republican base this depressed and angry, immigration can be effective wedge for Barr. He doesn't have to finesse his position very much to attack the guy talk radio calls "Juan Amnesty McCain."

The effect this will have on the election, of course, isn't just a zero-sum vote-for-vote effect. It has the potential to box in McCain the way Ralph Nader boxed in Al Gore. How much can McCain brag about his immigration reform cred in public, to Hispanic voters, without Barr rallying the talk radio vote? How much time or money does Barr make McCain waste in a gimme state like Georgia or Alaska, the way Nader made Gore waste time in Oregon and Minnesota? Republicans are avidly hoping that Paul does not rent his donor list to Barr (or Chuck Baldwin) because they see the potential here.

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