Thanks to Cordley Coit for the heads up.
The lady arrested Carol Kreck is a librarian and her crime carrying a sign saying McCain=Bush. This was on the property belonging to the Denver Center for The Preforming Arts. The DCPA is a theater complex where free speech laws are challenged in plays but not in real life. The lady is about 60 and 5 foot two and slight they had five cops arresting her.

On orders from Senator John McCain's security detail, Denver police escorted a 61-year-old Librarian away who was waiting in line to attend a so-called town hall meeting with McCain that was billed as open to the public.

Carol Kreck, who works as a librarian in Denver, held a homemade sign reading "McCain = Bush." On orders from McCain's security detail, police cited her for trespassing and escorted her to the sidewalk. She was told if she returned she would be arrested.
This episode by McCain's Secret Service appears to be a rerun of McCain's 2005 town hall in Denver with President Bush in which the Secret Service had three Denver citizens removed from an "open" event where McCain was campaigning with Pres. Bush for his plan to privatize social security.