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If someone is saying, as I overheard a man in the locker room at my gym not too long ago, that Obama is a Muslim and won't salute the flag etc. etc., that person is already lost as a voter. Not necessarily because he or she is incapable of being informed that this information is false, understanding and accepting that fact, but because he or she is susceptible to the next wave of misinformation to come along, and the one after that, and the one after that.
I wonder if this web site is the right strategy, but I don't see what choice he has. It may be better to simply stick to the high ground and focus on the voters with the intelligence and wherewithal, not to mention the frustration with current policies and events, to actually follow through and vote for him in the fall.