In what ways does the U.S. Presidency support and limit the formation of an ideal democracy?

I believe that the best U.S. President to support the formation of an Ideal democracy is one that is a conservative and one that doesn't want a government to be big and have regulations and bail out powers.  The best one that comes to mind is Ronald Reagen.  The government should not have to much power and control over us the democracy in which they do now.  When Obama passed the new health care bill it's something that limits our democracy and which it is now being consider a violation of the Constitution.