1) You know all those Sanders supporters vowing to stay home if Hillary wins the nomination? Plenty won't make good on their promise. With all the "Trump's a fascist" hysteria being ginned up, a significant number will be guilt-tripped into hitting the polls. "Social Justice" being today's religious fundamentalism, these folks will line up so they can proudly tell Facebook they "stopped fascism."
Clinton did extremely well in critical states like PA and OH. There is no scenario where Trump takes California, so even if Sanders wins there, it means nothing. Sanders' leaving might tip West Virginia to Trump, but that's about it.
Bernie's fans will not vote Green or Libertarian or any other spoiler parties. The Nader in 2000 narrative will be sprayed around like mace at a Trump rally. Any third-party protest vote will more likely come from aggrieved Republicans, denting Trump (albeit only slightly).
But what about:
Among self-declared Sanders supporters, 20 percent said they would support Trump over Clinton in a general election match-up, up from 10 percent who said so in a March poll. Among 18- to 29-year-olds, Clinton barely led Trump, by 45 to 42 percent, compared with a 64 to 25 percent lead in March.
Bernie fans won't flock to Trump in large numbers. Wait until Bernie is gone and it's just Trump vs. Clinton without any distractions. Wait until Trump starts launching daily zingers about the Webster Hubbell rumors, Whitewater, Lewinski, Bill's alleged lovechild, you name it. Bernie supporters will have nothing to focus on but Trump's antics. Their dislike of Trump will cancel their disdain for Hillary's anointment.
2) The rise of hard right parties in Europe will be used to heighten the "Trump is Hitler" panic and sway fence-straddlers to vote Hillary. The supposed rise of European fascism will embolden voters unable to even name the Heads of State of the countries where this alleged fascism is returning, because those voters JUST KNOW something they aren't supposed to like is happening someplace they've never even vacationed. Take that, party/politician/country I've never heard of!
Any gaffe, skirmish, scandal (sounds like a decent board game) from Front National, AfD, etc. will get manifestly more coverage stateside than would occur outside of Trump season, and the subtext to the coverage will be: "Don't let it happen here by electing The Donald."
3) When the Brexit vote fails, the West's "anti-establishment" wave will receive its first mortal blow. I think Brexit will fail by no fewer than five percentage points, pricking some of the air from the "We're taking back our country!" wave broiling in Western nations. You can be sure there will be a massive intellectual and legal crackdown following this failed vote to ensure nothing similar happens again.
When Scotland was supposedly going to vote out, suddenly you were hearing about breakaway movements in spots like Northern Italy and Catalonia. Once "Free Scotland" failed, you stopped hearing about "the fracturing of Europe." Brexit's flopping will have a similar cooling effect on American rages against the machine.
4) President Obama is leaving on a high note.
Unlike the 2014 elections, the President will be an asset - a major asset - this time around. Don't take my word for it:
But amid what has become a vicious 2016 campaign, the public is growing fonder of Obama. His approval ratings have been 50 percent or higher for 11 of the past 12 weeks, a level he hadn’t hit in more than three years. His current rating -- 51 percent for the week ended May 22 -- is two points higher than Ronald Reagan’s was at this phase of his presidency, according to Gallup data.
Going back to 1952, the incumbent party won the largest share of the popular vote in nine out of 10 elections in which the sitting president had an average job approval rating of at least 48 percent
Hillary is closely tied to the once again popular president, and he will almost certainly do a first-rate job of selling her. He will speak at the convention, and being the first black president, there will be an explicit narrative of: "In 2008 we made history, let's be sure we don't elect someone on the wrong side of history."
When he says those exact words at the convention, tell your friends you read them here first.
And a bonus...
5) Republican organization will remain spotty. Bill Kristol's "resistance" will be far less influential than his addled mind believes, but there will be enough disunity and sabotage within the party to disrupt Trump's "ground game." Ryan finally came around to "endorsing" Trump: it means nothing. Not only did it take forever, but Trump's buzz rests upon running against Washington hacks like Ryan.
Think about the convention. How many high-profile Republicans will risk their careers by speaking? Picture those who would accept such a socially incriminating invite, how much broad appeal will they likely possess? Carl Icahn won't do it, and if he did, imagine how poorly someone like him would go over in swing states like Ohio and Pennsylvania. Then there's Newt Gingrich...will that neutralize all the "Trump hates women" rumblings?
What kind of new all-time shocking quotes will emerge from Trumps's acceptance monologue? When the convention becomes a circus, the WHAT THE HELL WILL TRUMP's ADMINISTRATION LOOK LIKE question will be everywhere.
When faced with mayhem or mediocrity, eventually more than enough voters will choose mediocrity. Even without mayhem, the makeup of the electoral college now makes Democratic presidents all but inevitable. Just ask Tofu in a Tie.