Weird Note Left on My Doorstep

Has anyone else received this? It reads:

"Boise -

We are throwing apples on rooftops of supporters of Jeff Merkley.

No Paycheck, No Future"

My roommates and I were a little surprised because we don't really know who Boise is nor do we have any signage or bumper stickers declaring Merkley. I have met him once and talked to him at a work function but I highly doubt anyone knows that.