Kind of a muddy answer, but in February he endorsed Bloomberg, who is a Republican, but barely. See link...http://kydem.blogspot.com/2008/02/mark-cuban-endorses-mayor-michael.html
Republican.
Political Parties in the United States of America.
Owner of the Dallas Mavericks.
Republicans like this country because it's a constitutional republic, the Democrats like this country because it's a democracy.