Here is a question...

What would the "collusion" between the Russian Hackers and Trump campaign actually look like?

To me, there are only really three actual situations where one could offer some proof of collusion that would measure up to any standards of criminal behavior:

1. That someone from the Trump campaign "helped" the Russians hack the Clinton emails. 
2. That someone from the Trump campaign "payed" the Russians to hack the Clinton emails.
3. That someone from the Trump campaign "knows" the true identify of the actual hackers. 

Otherwise, what exactly would the FBI, the Senate Intelligence, or the House Intelligence committees really be looking for?  

For anyone to prove collusion... the first thing that they would need to do is actually know (for sure) who the hackers are. Knowing that they are Russian or making an assumption that Putin must be directing them, does not in any manner, shape, or form rise to the level of knowing the identity of the hackers. You simply cannot prove any sort of collusion without actually knowing the identities of both of the alleged parties that are supposedly colluding.

Like moths drawn to light... Liberals are drawn to conspiracy theories

Moreover, it's very unlikely that any of the Trump people being mentioned as possible targets of the investigation would have the computer expertise to "assist" the high level hackers that got into the DNC and Clinton campaign servers. It also doesn't seem very plausible that these hackers would be paid by the Trump camp while simultaneously being directed by Putin (which is the official U.S. Intelligence stance at this point). 

So that leaves the possibility that someone within the Trump campaign has personal knowledge of the true identities of the hackers, possibly having some communications, and has not turned this information over to the authorities. This could be collusion in the sense of obstructing justice (or possibly an accessory) rather than anyone being an active participant. 

Reality: It appears like most of those on the unhinged left tossing around the allegations have not really reconciled what it is that they are exactly looking for.  They just know that they are hoping someone finds some "ties" (in the most generic term)... that even if they exist... probably don't prove anything even remotely close to actual criminal collusion. 

This is a classic case of someone engaging in some serious cognitive dissonance. They just "feel" like something must be there, and will continue to demand that the lack of evidence found so far is just more proof that we need to ramp up the investigations.

Either that, or the powers to be in the Democratic Party understand that their followers are not quite bright enough to look at this with their eyes open. They know that their supporters (much like a moth drawn to light) will reflexively become all discombobulated at the thought of more conspiracies by the ever evil (and certainly crazy) President Trump.