When a party controls the government’s purse strings for enough time, those purse strings become the politician’s reason for existing. If a segment of that party has ideology which is against using those purse strings for personal gain, then that segment will be removed from the controls of that party. They will still desire the votes from that segment, but cannot bear to have them involved in governance. If members of that segment still vote for them, they can pander to that segment, claiming to be working for them, without actually doing anything. Many segments of the Democrat Party have long fallen for this, though many were pulled over to the Republican Party by Reagan during the 80′s.
If you refuse to vote for them, they will become a long-term minority party, but usually, the opposition will see this and reward the politicians of minor party with their share of graft. At least if we don’t vote for them, a third party may be strengthened, and has happened (rarely), become a prominent party to support the original ideals of the people.
