The Assassin - Harry Starke Genesis, #3

Who wants Senator Andrew Hawke dead? How many must die to make it happen? It was a bad day all round for Tommy Biscotti and his friends. All Tommy wanted was a few pills. What he got was a bullet in the back. Hammerhead, Tommy's source, got two in the head. Jake Burke, Hammerhead's sidekick, got his brains blown out. Pretty standard stuff for the low life's of the underworld. But what did it all have to do with Senator Andrew Hawke's run for governor? Who is the assassin? To Harry Starke the answers seem obvious.
but as we all know, in the real world nothing ever is...