Americans wearing Tea Party gear turned away from polls

It has begun...

Several Dallas Tea Party members report being not allowed to vote today while wearing Gadsden flag t shirts and pins and Dallas Tea Party shirts. Today was the first day of early voting in the State of Texas. The Dallas Tea Party is currently investigating and speaking with lawyers to determine how to respond.
Reportedly, several members at different polling places throughout the Dallas/Ft. Worth Metroplex were told they could not vote while wearing clothing articles depicting the Gadsden flag, pin and/or the Dallas Tea Party. They were told by polling officials wearing these articles represented electioneering at the polling place, which is illegal.

More here at angrywhitedude.
My question is, how is it electioneering if the Tea Party is not a political party? How is the Gadsden Flag electioneering any more than the American Flag would be?