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I respectfully submit, that if all you took from El Cid's citation was teh march, you may have missed this point. To wit:
...these leaders represented organizations whose members were all overwhelmingly loyal allies and fervent electoral supporters of Franklin D. Roosevelt.
Those who had been strong supporters of FDR were prepared to organize against him on issues of particular importance. I find it gives the notion of "loyal opposition" a new meaning. It's also fully consistent with the theme of Glenn's column.