Noon-hour visitors to Cesar Chavez Plaza were able to view more than just a farmer's market Wednesday. They also witnessed about 20 activists and members of the media in a press conference announcing the "Stop Lou Dobbs" campaign created by the national Latino community group, www.presente.org. The group formed as a response to anti-Latino sentiment in the media, starting with who they feel is the worst offender: CNN's Lou Dobbs. According to the group's website, www.bastadobbs.com, Dobbs uses his news program "Lou Dobbs Tonight" to spread false information about immigrants and Latinos. Held only hours before CNN debuts a four-hour documentary called "Latino in America," the group came