That's where the primary threat comes in, from the group started by former Democratic Party Chairman Howard Dean, Democracy For America.

"Ahead of today's votes we wanted to be very clear to Democratic members of Congress: If you vote for either Medicare-cutting Trade Adjustment Assistance legislation or Fast Track Authority for the job-killing Trans-Pacific Partnership, we will not lift a finger or raise a penny to protect you when you're attacked in 2016, we will encourage our progressive allies to join us in leaving you to rot, and we will actively search for opportunities to primary you with a real Democrat," said Jim Dean, chairman of Democracy for America.