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Among the worries on the left: That conservative members will insist that history has "vindicated" loony Senator Joe McCarthy.
Among the worries on the right, as expressed in the above picture from the website of the Texas Freedom Network: That the kids today are being taught too much of that damn hippity-hopper stuff. The signs were posted at the Texas Education Agency as part of a Tea Party event, TFN says.
The TFN is live-blogging the hearing here.