It's starting: All it will take is just one of these people to lose control, and yes... spit. From Yahoo News:

Sgt. 1st Class Jeff Due, right, a U.S. Army recruiter, is surrounded by protesters at Seattle Central Community College, Thursday, Jan. 20, 2005, in Seattle. After about a 10-minute standoff during which protesters tore up U.S Army literature, the protesters were successful in getting Due and another recruiter to leave their table under escort by campus security officers. Several hundred students walked out of classes at several Seattle colleges and universities to protest the inauguration of President Bush.

A poster at ar15.com had insight to post these two pics together. Falluja '04 & Seattle '05: