That would work if Trump were just like Sanders but that is not even close to reality. Those saying Trump is a lib have no real basis for saying so. Trumps positions are as conservative as any in the race. Yes he has supported democrats and democrat positions in the past but then so did Ronald Reagan, people change. Now if you want to say you don't believe Trump has changed that's ok but keep in mind that is just an opinion and is NOT supported by anything other than your own personal judgement.
On trade, their positions are identical. On Kelo, Trump is to the left of Sanders.