Trump could very well be the last person standing in 2016, regardless of WHO the Dems put up. The Dems canidiate could very well be a scapgoat figure.
6 months ago, it was between the party-anointed Bush-Clinton clownshow; now with Trump into the mix, I didn’t even see that coming. (I’ve been away from it all for several months.) Trump reminds me of a late-50s/early-60s Democrat, who put America first.
"Candidate" and "Scapegoat" are the words you were looking for.