If you remember, Hillary won the popular vote and Obama won in super delegates which put him over the top. Endorsements matter very much in the grand scheme of things.

Am I reading that superdelegates can override the results of a primary election? And that's how Obama won the nomination from the Democrats in the 2008 primary?

No. Superdelegates could certainly determine the outcome if the delegate counts from the primaries are close enough for a significant majority of the superdelegates to go the other way.

Obama gathered the most delegates from the primaries in 2008.

Michigan and Florida had been excluded for bucking rules on the timing of their primaries.

Total - Obama - 2229.5 Clinton - 1896.5
Super Delegates - Obama - 463 Clinton 257
Pledged Delegates - Obama - 1766.5 Clinton 1639.5

2118 needed to win.

And that poor guy they cut in half...

There are posters here and even pundits who believe a candidate can be nominated without a majority of delegates. If no candidate has a majority of delegates at the Convention , pledged delegates are released after the first round, and then the Convention becomes a voting body.

Oh,I am omitting some steps and the superdelegates.

Confusing, because I thought someone stated that Hillary Clinton won the popular vote, but Obama had the superdelegates. Would someone like to clarify that further? Is there a percentage of the popular vote that needs to reached to be a shoo in?

Bernie Sanders is incredibly unpopular among past and present members of the House and Senate.

https://en.wikipedia.org/wiki/Congressional_endorsements_for_the_United_States_presidential_election,_2008

And Oprah. Whomever Oprah picks will be the nominee.