FESTUS, Mo. (UPI) -- A group that opposes gay-rights laws will announce a petition drive aimed at amending the Missouri constitution to keep state and local governments from prohibiting discrimination based on sexual preference. Kerry Messer, a conservative lobbyist and director of the newly formed Amendment Coalition, says his group will open the campaign Monday in Jefferson City. Messer says the coalition does not want to deny equal rights to homosexuals. But he contends that gay-rights laws passed recently in his hometown of Festus and other Missouri communities go too far by unintentionally giving special rights to people of any sexual orientation, including pedophiles and prostitutes. ``We're saying that you have to accept another human being, but you shouldn't have to accept another person's behavior,'' Messer said. Messer declined to say how many people belong to the coalition. He said the group is closely tied to the conservative Missouri Family Network. The secretary of state and attorney general must approve the petition's wording before coalition members can hit the streets. Messer expects to begin collecting the needed 200,000 signatures this summer. The petition would call for a voter referendum to decide ``whether or not people of various sexual orientations should have special rights because of their sexual behavior,'' Messer said. Passage of the referendum would amend the constitution.