Is a Catholic who belongs to a political party that supports sins in its party platform excommunicated?

Is a Catholic who belongs to a political party that supports sins in its party platform excommunicated? Before Vatican II, a Catholic belonging to the Communist Party (or any other association machinating against the Church) was *ipso facto* excommunicated. 1917 Code of Canon Law : >Can. 2335— Those giving their name to masonic sects or other associations of this sort that machinate against the Church or legitimate civil powers contract by that fact excommunication simply reserved to the Apostolic See. 1983 Code of Canon Law : >Can. 1374— A person who joins an association which plots against the Church is to be punished with a just penalty; one who promotes or takes office in such an association is to be punished with an interdict.