Tax the hell out of those people.
If you mean the Saddleback church, for which I hold no personal emotional or ideological fondness, I would note that Warrren has not spoken or advocated publicly for either candidate. If he had, under the aegis of his congregation, said congregation could be denied its tax-exempt status, as should all those churches that routinely lend their pulpits during regular worship services to Democrat candidates for the office of President for the purpose of making an appeal for votes.