"If you take a look at the two parties, they differ on a lot of issues, including health care, abortion, equal rights for people with nonstandard sexuality, social programs, and the role of government in the US. They agree on many issues, including some I disagree with, but that's how it's going to be with the two-party system our election processes implicitly mandate."
You seem to have this odd idea that what they say to you to get elected and/or divide you is what they care about/stand for/etc. Stating two positions and pretending to be competitors means the things they want can pass while the things they don't but said they did can fail and be blamed on "the other guy" who is really just part of the same team.
Look at the illegal NSA domestic wiretapping. Whose interest did it serve for some to pretend outrage, some to claim support, then pass a bill to "reform" that actually just gave congressional blessing to unconstitutional and illegal actions? Whatever congress had the authority to legalize was legalized by the bill and the bill has language legalizing all sorts of things congress doesn't have the authority to legalize. Somehow both parties were on board with "reforming" by blessing in reality and lying to the public indicating they were putting a stop to the illegal activity on the other?