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I read that @dan set his rep to be minus 18 somehow (maybe with massive downvotes).. It will take a lot of upvotes to correct that!

okay, is there any page i can read about the beef between @dan and bernie?

You can just search through the steem blockchain around the time period of this post:
https://steemit.com/steemit/@berniesanders/6g6eag-berniesanders-signing-off

This is @berniesanders signing off! :D