Usage patterns
〈人〉が政党を結成するfor someone to form a political party
They formed a new political party.
政党に所属するto belong to a political party
He doesn't belong to any political party.
政党を支持するto support a political party
Many young people support that political party.
政党が分裂するfor a political party to split apart
The political party split apart due to internal conflict.
〈人〉が政党から立候補するfor someone to run as a candidate from a political party
She decided to run as a candidate from that political party.