"Instead of going on Obamacare and abiding by the same laws and requirements as everyone else in it, members of Congress can now receive tax-exempt contributions from their employer (the federal government) to their health care premiums on the Obamacare exchange. This will create one set of rules for the American people and a different set of rules for Congress."<quoted text>
There is no exemption.
If Congress had to be subjected to ObamaKare, it would be gone tomorrow.