A McCain aide, Jeff Sadosky, said hotel security and the Albuquerque police asked the abortion rights activists to leave the event after McCain's campaign had given them passes to enter.
Here's part of a release from the New Mexico arm of NARAL Pro-Choice, the abortion rights group:
Heather Brewer, executive director of NARAL Pro-Choice New Mexico, said today that three pro-choice New Mexicans wearing NARAL Pro-Choice New Mexico T-shirts were denied access to Sen. John McCain's town hall meeting at the Hotel Albuquerque on Tuesday even though they had tickets to the event.
Several security officers confronted the pro-choice attendees, but gave no explanation for ejecting them as they waited in line with the other nearly 500 participants. Instead the pro-choice ticketholders were simply told that they were trespassing and the officers threatened them with arrest....
"Our folks had tickets, followed the rules and were waiting in line just like everyone else," Brewer said. "I can only assume that it was their NARAL Pro-Choice New Mexico T-shirts that inspired security to single them out from the hundreds of other people there and to threaten them with arrest. If Sen. McCain has a problem with women accessing birth control, he should state that publicly. His voting record makes it clear that he does not support access to birth control, so why is he ducking the issue at his own town hall meeting?"
...After being confronted by security officers, all three pro-choice ticketholders left the building without incident.
http://www.politico.com/blogs/bensmith/0708/Naral_Prochoice_tshirtwearers_barred_from_McCain_event.html