I checked my meetup and everyone appears legit.
During the NV caucuses we had a meetup group and the leader of the meetup group who is fully legit was concerned about a member who was questionable in his eyes. The person that he questioned was actually in my eyes very legit as he had great posts around the web supporting Ron Paul. That poster has consistently supporter RP and still posts on the DP today.
As a meetup host you should always greet new members with open arms. Even if they are a mole they still have a conscious and might help our delegation.
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