The reasons are clear.
He's the only Republican who isn't whining.
Yes, he's out there spouting off a bunch of ignorant, vile, racist shit. And he's insulting good people, left and right and moderate and undecided. But he isn't whining.
And when the vote is between a rich, loudmouth, ignorant bigot on one side and 16 whiny little wussy-boys (and one little wussy-girl) on the other side, the ignorant bigot is going to win every time.
Please, all you also-ran Republican candidates who aren't Donald Trump, please tell us again how the bad old Obama hurted your poor wittle feelings by being President and doing President things, like negotiating treaties and signing trade deals and standing up for the rights of people who aren't rich, white and straight.
Tell us again how that mean old Hilary kept her emails a secret and didn't share them with you and how her hubby fooled around with loose women and lost money on land deals back in the last century. Oh you poor babies, life is so hard for you.
Tell us some more about how those hurtful old black folks made you take down your pretty loser flag that you love so much, or how those terrible slimy Mexicans want to take away your jobs, or how those nasty women are trying to get health care.
I'm so old, I can remember when Republicans had a spine. For the last eight years they've been a party of wussy-baby morons. Everyone's out to get them, everyone's picking on them, life is so hard, so very very very hard for you sad little pieces of white, rich privileged dung.
Wah, wah, wah! Cue the violin music. Bunch of whiny jellyfish.
One billionaire bigot vs. 16 whiny jellyfish.
Who do you think is going to get the votes?
Keep on whining, and in about 15 months the Democrats are going to give you all something to cry about.