from The Conservative Treehouse:

As the geography narrows before us, it is important to remember the stakes and avoid the distractions.  As a consequence, the baseline must be reaffirmed. It is critical to understand that both the DNC and RNC are private corporations with no affiliation to government.

It is a difficult shift in thinking, but the party system in U.S. politics revolves around two distinct private corporations, two clubs that feed from the same corporate trough and position for influence and affluence within a political dynamic they control.