Yes, you have to allow parties, and force the party you want in power. It upsets people, but that's that. I had a game where communists won the election, it became a proletarian dictatorship. So I had to allow parties, which changed our constitution to a 2-party system at the end of the month, thus allowing me to set the party to socialist, and call another election. When you call the election make sure that another democratic (conservative, liberal, socialist. Reactionary might get Constitutional Monarchy?) party takes power, if you can.