I am not implying that politicians are corrupt (although some are). I am willing to admit that most are honorable persons. But the need to constantly raise funds for their campaigns (for election and reelection) corrupts the democratic process. And the unwillingness of most members of Congress to change this situation makes them accomplices in that corruption. Such practices are illegal in most democratic countries. Many ministers of European governments have had to resign when it came to light that they had received private funds for the electoral process.
An excellent article here by Professor Vicenç Navarro pointing out exactly why Obama, even if he wanted to, could not launch a universal healthcare system in the USA.