• Different parties represent different segments of the population — differences in region, population density, gender, race, occupation
• Increases compromise on legislation, ensuring a variety of viewpoints are represented in final law.
• Stops or at least modifies bad laws that would screw one segment of the population to appease another segment of population’s ideological beliefs.
• Increases constitutional protections by allowing one party to raise constitutional questions related to their ideological beliefs.
• Allows one party to investigate the other party, increasing honesty in government.

… it’s really not clear that it’s a bad thing.