Those violent Republicans?

It's Funny Only Until Someone Loses a Pie
Last October, two liberals responded to my speech at the University of Arizona --during question and answer, no less--by charging the stage and throwing two pies at me from a few yards away. Fortunately for me, liberals not only argue like liberals, they also throw like girls...
...In the three weeks following the dismissal of all charges against my attackers, three more conservatives were attacked on college campuses.
On March 29, liberals' intellectual retort to a speech by William Kristol at Earlham College was to throw a pie. On March 31, liberals enjoyed the hurly-burly of political debate with Pat Buchanan at Western Michigan University by throwing salad dressing. On April 6, liberals engaged David Horowitz on his ideas at Butler University by throwing a pie at him.
Column by Ann Coulter on the various attacks on conservative speakers.

Courtesy Lars Larson:
Audio of KGW's (NBC-8) Andrea Cantu reporting on a Howard Dean speaking event.
Peaceful despite Republican presence audio