Anarcho-Vandals threw a brick marked with a sign of anarchy through the downtown Republican headquarters early Tuesday.
The brick shattered the glass at the front of the headquarters, landing near the rear of the office, said vice chair Lou Ann Zelenik.
"It (the brick) said anarchy," Zelenik said.
Zelenik said the glass shattered a beach ball children play with when they visit the headquarters.
Volunteers hoped to clear the glass before the party-sponsored downtown concert with Aaron Tippin and Pat Garrett at 6:30 tonight on the downtown square.
"I was sick," Zelenik said of the vandalism. "Why would somebody want to do this? We need Republicans, Democrats and independents... and I think that's what freedom stands for."
She doesn't understand why someone would be angry enough to commit the vandalism.
"America is the world's last great hope," Zelenik said. "I don't know why anybody would do this in this country."
Workers said it may cost $3,000 to replace the glass.