Questions on Health Care Reform

[Huurraaa]

I know almost nothing about politics, so I just want to ask some basic questions instead of starting a debate.

Every time I hear a debate between democrats and republicans, all I can see is two groups of people fighting for power/profit, and even if one party claims how their policy will benefit the country, it must benefit their own party somehow.
And even if the policy will really benefit the country, the other party is still going to oppose because they are just fighting for power. I feel my reasoning is too simple and probably flawed, and here are my questions:

1. Does the democratic party/their interest groups benefit from the health care reform?
If yes, how? (who are their interest groups?)
If no, why would democrats strongly support the reform?

2. Does the reform hurt republicans/their interest groups?
If yes, how? (who are their interest groups?)
If no, why would republicans strongly oppose the reform?