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"I proudly entered to VOTE wearing my "IMPEACH BUSH AND CHENEY" shirt."
In most places, no one, including voters, is allowed into the polling place with any campaign material visible nor are they allowed to discuss politics in the polling place. What you were doing could be viewed as campaigning inside the boundary, which is not allowed.
Your judge was likely just doing his or her job, not discriminating against you. As a judge, I've had to do this several times, mostly to people whose views match mine. The integrity of the process is important.