Independent

From Conservapedia

In political usage, an independent refers to a politician or voter who does not belong to any political party. In the United States of America, Ross Perot is one of the best-known independent candidates to run for presidential office. In those countries with a two-party system, independents may espouse viewpoints from both parties or may even run on a single-issue not favored by either.

Sometimes, even nominal members of political parties are "independents". For instance, Mike Huckabee has been willing to take conservative religious positions that other Republicans have not. He has also taken some positions which could be seen as liberal. For this, many label him an "Independent".