According to the latest McClatchy national poll, Donald Trump is now trailing Hillary Clinton by 15 percentage points:

New McClatchy national poll (change from last):

Hillary 48 (+6)

Trump 33 (-6) The last poll was before both conventions… yikes, Trump. — Josh Jordan (@NumbersMuncher) August 5, 2016

There are several reasons why Trump is quickly losing ground: the Republican National Convention was a disaster, the Democratic National Convention was a success, Trump’s attacks on the Khan family, his continued attacks on conservative leaders like Senator Ted Cruz, and on and on it goes.

The number one reason, however, is Donald Trump himself.

Let’s face it: Trump is a loose cannon. He’s a narcissistic megalomaniac who just can’t keep his mouth closed. He’s probably the worst candidate the Republicans have ever put forth. And that’s saying something; I haven’t forgotten about Bob Dole.

That’s bad enough, but what’s worse is that some seasoned Republicans are actually enabling him. If they had the best interests of America and of the GOP in mind, they’d tell Trump to stop doing his insane routine. Instead, they’re going after every single person who dares say something remotely critical of Trump and his horrendous strategy.

The main example of such an enabler is Rudy Giuliani, the former mayor of New York:

“So first of all I find the word intervention completely out of line,” Giuliani said during a discussion on Fox Business’ “Mornings with Maria.” Giuliani then singled out Gingrich specifically. “That word, I think, honestly I love him dearly, but I think that word was used by Newt in a memo that got around,” Giuliani said. “What a ridiculous word. An intervention is for a drug addict and it’s for someone who’s an alcoholic and I’ve had to do them with people at times. There’s nothing wrong with them, if that’s the case. Donald Trump doesn’t drink or smoke, by the way. We don’t have that problem.”

This is the kind of insanity that’ll prevent Trump from ever becoming a serious candidate. If Giuliani truly wants to help Trump win, he has to stop being a sycophant and start being a real adviser. Shockingly — for Giuliani at least — that means having the courage to tell Trump the truth, no matter what.

And the truth is that Trump is on course to lose the election. Badly. If he doesn’t reinvent himself, he’s done. Giuliani should tell him so. Apparently, the former mayor is more interested in staying in the billionaire’s good graces than in winning.