Moreover, the individual may be advised that, circumstances warranting, the Ordinary may, after the expiration of a certain allowance of time as set forth in the monitum, publicly declare him to have been automatically excommunicated for heresy according to Canon 1364, No. 1, and deprived from the reception of all of the Sacraments (Canon 1331, No. 1 as well as Christian burial (Canon 1184, No. 1).If THAT doesn't get the straying politician's attention, he is completely dead in sin.
He was excommunicating abortionists and clinic employees over 10 years ago. You bet he's serious.