"His entire life, especially in public office, with a record of bad decisions, inability to form coherent unscripted sentences, coupled with that self-satisfied smirk, all prove he's usung a rubber wheel on the third rail."
Doing something extremely stupid or reckless usually for the amusement of others or for the thrill of doing something daring. Often occurs as a result of peer pressure.
The expression originates from the urban myth(?) of someone dancing on the railroad tracks and paying for the foolish mistake with their life.