Building off that Peter Beinart post, Larison diagnoses Lieberman:

Looked at from either side of the spectrum, Lieberman has been anything but interesting. He has been the reliable defender of the “centrist” consensus established in the ’90s that finally accepted welfare reform and insisted on U.S. hegemony abroad. In practice, this “centrism” can be used to justify the most extreme, violent and destructive policies, but it is considered reasonable and acceptable because it does not partake of “fringe” ideas and enjoys the support of respectable, “serious” people.

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