Come on Trump never formally ran for anything. Since you are so sure, I am sure you can provide a link to a debate or rally from before? Having a web-site does NOT constitute formal running for president.
I’ll be glad to... These are just a few, but I’m sure you could have googled it too. You just didn’t want to face the FACTS. Besides, Trump’s documented positions, whether he is a politician or not, are just as relevant as a politicians because it shows his beliefs and gives and indicator of how he will govern. If you don’t understand that then you are worse off than I thought!
Here is a reference to the undeclared presidential candidates debate
http://www.nbc.com/saturday-night-live/video/gop-debate/n13120
Here is Trump withdrawing from the nomination:
http://www.theguardian.com/world/2011/may/16/donald-trump-us-presidential-race