Something had to break. The optics of the goose stepping left having only one candidate were just not palatable.
My gut says he is / will be infused with Clinton money.
I haven't heard anyone else suggest this yet, so I just wanted to get on the record. Mark my words.
Full Definition of STALKING HORSE
: a horse or a figure like a horse behind which a hunter stalks game
: something used to mask a purpose
: a candidate put forward to divide the opposition or to conceal someone's real candidacy