political parties, party
Capitalize specific parties such as Communist, Democratic, Fascist, Labor, Liberal, Republican, Socialist:
the Democratic Party, the party
a Democrat
Democratic platform
Democratic Convention, the convention
Republican Party, the party
a Republican
Republican platform
Republican Convention, the convention
Lowercase communist, fascist, liberal, socialist, etc., when reference is to a political philosophy and not to a party:
republican principles, etc.
a liberal (general sense)
but the Liberals
a Liberal (member of party)
Capitalize Party with name of a political party:
Labor Party, the party
Labour Party (British)
Republican Party, the party
Communist Party, the party