Stringing people along often backfires.
A young woman who was a college friend of mine when we were both in our last year had a boyfriend who proposed to her more than once. She told me that she'd eventually say yes, but that she was testing him to see if he really meant it.
He finally asked someone else who said yes, and the two of them went to Vegas and got married that weekend, just before graduation. My friend was devastated.
Sometimes, testing people leads to circumstances you didn't anticipate. It's always risky to put decisions off to make some sort of point. People often lose patience and just move on.
Maybe it's time for Bernie Sanders to stop stringing Hillary and the rest of us along. I don't know...
ETA: This post is about an endorsement. The primaries are over. Maybe I wasn't clear.
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variety can't accept that the US is no longer revolving around them. 
If its time for a Sanders endorsement...something that no sane person should expect to come without actual policy concessions from camp Clinton, then its equally time for Hillary to make those concessions and to lay out a specific plank of proposals that show she actually wants the support of Sanders supporters and start making full-throated ambitious proposals of new progressive initiatives that show she was paying attention to what we were fighting for...which isn't what she stands for. It requires movement from where she is and what she believes in. It requires her to forsake the traditional "move to the center for GE season."
All we're seeing is Hillary say that she's a progressive, continue to appoint the same establishment insiders endorsing the same anti-prog policies to things like the platform committee, the names of our worst enemies of progressives inside the party being bandied about as potential VPs (Castro, Kaine, Booker)...it's interesting that we managed to get one of the most progressive party platform proposals ever, but it's devoid of an actual progressive initiative that isn't both curbed in her establishment cent-left ideology and isn't exactly the same proposal and worldview she's held for years.
Where are the great, ambitious proposals meant to make our lives better? I'm not talking about her proposals to fix the cost of college for some at the expense of most with "pay-for-play" schemes like loan-forbearance for "job-creators" and "entrepreneurs" (such proposals help very, very few young people struggling under the weight of student-loan debt) and child-care subsidies. (A terrible proposal and one that I hope she abandons. It has the air of "children and families are inconvenient to my employer friends who wish for you to work more hours. I'm going to pay for daycare so you can spend less time not working!"
