One of the defining characteristics of the right politically, and the concept of freedom in general, is that power should remain as close to the individual citizen as possible.
Returning power into the hands of individuals is a core Conservative principal. Hence the common heard ideas: smaller localized government, school choice, less taxation, etc.
The Democrats in congress want to nationalize health care, nationalize the oil companies, and raise your taxes (aka. force you to pay for it) to do it. Voters need to understand that this means handing huge amounts of power over to the state.
Pure and simple.