Same reason everyone goes there, money and power.
Massie would have played it much differently had he gone there for money and power. I think he's one of those Unicorns who actually put his life on hold in order to improve the well being of his constituents.
He's a very regular guy. He wears flannel shirts and jeans and hangs out with the locals when he's at home in Kentucky. The locals relate to him as a regular guy.
He always seems to be a bit bemused by the flagrant hypocrisy and corruption demonstrated by the members of Congress.
For example, one reporter was walking beside him as he went to his car--called Massie a third rate grandstander. Massie replied that he was at least a second rate grandstander then cracked up laughing as he got in the car.
