What meaning does it have? None that I can see. It would be different if Trump had been a politician, and held an office as a democrat. He never was a full blown democrat like Bernie Sanders or Harry Reid. Trump said he’s always identified with both democrat and republican on different ideals.
Poll: 70% of Republicans Think Trump Will Be Nominee
http://www.breitbart.com/big-government/2015/12/11/poll-70-republicans-think-trump-will-nominee/?AID=7236