CHARLESTON, W.Va. — When Hillary Clinton tries to vanquish Bernie Sanders in West Virginia’s Democratic presidential primary next month, she’ll also have to watch out for Keith Judd.

That should be no sweat, right? After all, Judd is a political nobody and a felon, who barely scraped together the $2,500 needed to get his name on the May 10 ballot by using his wages from a job at a Texas hotel.

Tell that to President Barack Obama, who couldn’t stop Judd from winning 41 percent of the state’s primary vote four years ago.

Judd was still behind bars then, and many West Virginia voters had no idea who he was, but they were determined to rebuke Obama, whose clean air regulations remain deeply unpopular in the coal-producing state.