The Democratic party hired a former felon to organize troublemakers at events to create violence at Trump rallies that could be used to say Trump supporters are violent.
In short, the Democratic party organized people to create violence they then blamed on Republicans.
After the Project Veritas videos of the guy who organized it getting fired (which means the DNC knows he's guilty of it), the retractions of allegations of conservative violence are starting.
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Hillary Clinton's campaign is coordinated with super PACs through text messages, having the “Pony Express" consultants as intermediaries. So Clinton's campaign WANTED and CREATED that violence to make Trump look bad.
Since the man responsible has been at the White House more than 300 times and met Obama personally more than 40, we can be confident Obama knew and supported it as well.