Yes, Bernie Sanders can force a contested convention.
With the Democratic presidential nomination system working the way it does, there are essentially two possible outcomes: A candidate will either win in a blowout, or he or she will need superdelegate votes to gain a majority.
The reason for this is simple: Fifteen percent of all of the Democratic delegates are unbound superdelegates. So unless you have about an 18 percentage-point lead among delegates by the time the voting wraps up, you'll need some superdelegates to put you over the top. This makes the difference between a close race and a blowout a little murky — which can be advantageous to the underdog.
Right now, Hillary Clinton has about a 10 percentage-point delegate lead over Bernie Sanders. (For comparison: Barack Obama's pledged delegate lead was only about four percentage points by the end of the 2008 race.) The current margin is not likely to change much between now and the end of the contest, with the two likely to play to a draw in California, Clinton to win big in New Jersey and D.C., and Sanders to triumph in smaller states between now and the end of the race. For it to change significantly in Sanders's favor, he'd need to do very, very well in California and New Jersey in particular, a promise that he has issued often and delivered rarely.
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...he (Bernie) said. "She will need superdelegates to take her over the top at the convention in Philadelphia. In other words, the convention will be a contested contest."
That's true — mostly because, unlike in 2008, Sanders will contest it. Eight years ago, Clinton conceded the race before the convention, recognizing that trying to fight her way to victory on the convention floor was likely to fail, despite her having a slight lead in the popular vote. But Clinton realized the damage that could be done to the party — and perhaps herself — so she didn't.
Sanders doesn't share the former sentiment, as he has made clear. He was an independent until he decided to run for president, and his goal during his campaign has been to upend the system, into which a convention floor fight fits neatly.
But that doesn't mean he has any real shot at winning.
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Lots more at: https://www.washingtonpost.com/news/the-fix/wp/2016/05/02/yes-bernie-sanders-can-force-a-contested-convention-that-doesnt-mean-he-can-win-one/
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My commentary is in the form of the bold and underlined text.
= new reply since forum marked as read
Though other times I can't tell the difference.
I also commented below the excerpt (which is indeed properly indented) stating what part was my commentary where I added emphasis. It looks good on my phone too.
I can see the background color in excerpt on the monitor I use here at work (which I prefer), but I think other devices look different. I may try excerpt again - never know! I do appreciate the help though, just wanted to be sure you knew I wasn't a novice without being rude, which may not have come across well on these here internets. 
... and loving DU but being more active in election seasons, like most here, so may have missed changes...like I did.... heh 
And knowing that it can take years to learn about every function...
... and being awkward socially anyway. If I sounded rude or condescending, I apologize.
at the uncanny ability of Bernie supporters to penetrate the minds of Hillary supporters. It is here on DU that I heard that if I support Hillary it is because I want the country to move to the right (imagine my surprise as a lifelong progressive when I was informed of my political leanings in this manner). Now I learn that I do not support any principles but just think Hillary is so deserving and that it's her time. I had not realized that at all! I just thought I supported her because she has a good progressive track record, a good platform, and solid understanding of how government works, and with her gender being a nice bonus! Silly me. I should have come to you first so that I could have understood what is REALLY motivating me.
Thank you, dear Bernie supporters, you oh-so principled ones, for being so astute as to know what motivates us. How would we ever understand ourselves if it wasn't for you?
