Special Investigation and Russian Electioneering

One of the more looming stories over the American political climate these days that takes over pretty much everything else is the special investigation into the Trump campaign and potential collusion with Russian attempts to influence the US presidential election of 2016. There is a lot of information in the public domain about this story, including most recently Mueller seeking a revision of Paul Manafort's home confinement release after alleging that Manafort attempted to contact potential witnesses to conceal evidence relating to the various charges he faces.

You can find a decent overview of most of the publicly available information on the related wikipedia page.

So let's try to wrangle with all that public information. Please list, vet, and weigh the evidence you think is most important when it comes to the Special Investigation of the Trump campaign. Does it look like collusion with Russian electioneering happened or is this story mostly about finding incidental crimes of sloppy political first timers? What role do you think Russia played or tried to play in the 2016 election based on this publicly available evidence? What evidence would you like to see before making a judgment?