Poking fun at current events...
My guess is that many people funding the politics in our nation have dossiers of dirt on people in their own party to keep them in line and to do their bidding, basically by blackmail. Some of these people who have done a complete 180 on their support of various candidates and issue likely have some dark secrets they don't want to get out.
Truth is likely far less likely to shock constituents than the choices these folks are making against their best judgment, but to follow party lines.