Answer:
No, they don't.
Step-by-step explanation:
Political parties generally only focused on maintaining total votes to hold or improve their position. Influencing policies are most commonly done by Political Action Committee (PAC).
PAC is a group that commonly consist of people from the private sectors. (such as activists, business representative, etc). PAC usually funded several political candidates in order to influence the creation of a certain policy. The policies supported by PAC generally only benefited the members of the PAC rather than the citizens as a whole.