Why? Are they also law enforcement officials?
They get special privileges the rest of us do not have access to because they are the ruling elites ... Congressmen and Senators are a better class of people than you and me. They are afforded certain perks that we do not deserve and should not have access to.
It's in the Constitution, donchaknow.
Wherefore we now declare that therefore the subjects of the land shall be ruled by the elite class, whoupon this Constitution of these United States doth bestow the ability to grant themsevles rights and privileges that the subjects shall not attain but shall pay for through their noseths.
Really, you should read your Constitution once in a while ...
Some years back they quietly passed a little law giving themselves the status of a U.S. Marshal, no CCW needed.
I guess now some states are requiring that ammo be registered.