True, but Trump didn't officially make himself a politician until June of this year. We should check to see what his donation history has been since. Or better, let's go back to the past couple years as I doubt Trump woke up on a sunny morning in June and said "Gee, I think I'll run for president." This run has probably been in the works at least a year ahead of him announcing. So a full accounting of his 2014 donation history would be prudent.
Beyond that -- what would REALLY be prudent is to look at the bigger picture. What does it bode? Because that is where Trump's mind is -- he lacks a political compass; do some research and see his stands on nationalized health care, for example. Once upon a time, he was calling for single-payer! Long ago, but did nonetheless.
On the other hand, we have the option of voting for a guy, Cruz who has always opposed government-run health care in concept. Steady as a rock.
Trump lacks that quality entirely. His political "philosophy" is as variable as the markets, judging by his past. Cruz's political philosophy is straightforward and Constitutional.