if he's a dem plant he's doing a terrible job
You seem to be a smart dude, so I'll ask you this... Let's define what a democratic plant in the repub party would be assigned to do. I suggest their job would be to...
1) make the repub field look like a mess (Trump has done this)
2) insult and belittle the repubs with jokes about wives and thirsty and stupid (Trump has done this)
3) Remind everyone that 911 happened on a republican watch (Trump just did this)
4) Defend hilary whenever she gets unreasonable (Trump did this, as I just showed)
5) Attack hilary's dem enemies (trump attacking sanders as a communist, when he's 20 points back)
Add in trump's lifelong dem status until recently, the clintons at his wedding, and the fact respected repub columnist George will actually accused trump of being a plant this year (and I did in 2011)...
Well, if he's not a dem plant, he's seriously doing all the things you'd ask a dem plant to do, wouldn't you agree?