An ordinance of Central City requires every operator of a taxicab in the city to have a license and permits revocation of that license only for "good cause." The Central City taxicab operator's licensing ordinance conditions the issuance of such a license on an agreement by the licensee that the licensee "not display in or on his or her vehicle any bumper sticker or other placard or sign favoring a particular candidate for any elected municipal office." The ordinance also states that it imposes this condition in order to prevent the possible imputation to the city council of the views of its taxicab licensees and that any licensee who violates this condition shall have his or her license revoked. Driver, the holder of a Central City taxicab operator's license, decorates his cab with bumper stickers and other signs favoring specified candidates in a forthcoming election for municipal offices. A proceeding is initiated against him to revoke his taxicab operator's license on the sole basis of that admitted conduct. In this proceeding, does Driver have a meritorious defense based on the United States Constitution? 
No, because he accepted the license with knowledge of the condition and, therefore, has no standing to contest it.  No, because a taxicab operator's license is a privilege and not a right and, therefore, is not protected by the due process clause of the Fourteenth Amendment.  Yes, because such a proceeding threatens Driver with a taking of property, his license, without just compensation.  Yes, because the condition imposed on taxicab operators' licenses restricts political speech based wholly on its content, without any adequate governmental justification. 