Not only do you need correlation, but you also need some sort of causal mechanism. You can get by in vastly complex systems with a correlation, since causality's a nightmare.
In the case of Ukraine, no causality needed to be deduced. Which isn't to say that there was no causality. Election fraud was observed in more than a few places, both by Orange supporters and by non-Ukrainian observers. Observation beats deduction every day (well, mostly every day ... witnesses can be fooled).
I was a frequent reader/non-participant at Maidan, and sometime volunteer translator for a Canadian prof who was assembling press releases/summaries and the like. It was where Yushchenko supporters coordinated and reported. Maidan's not quite structured like DU, and the politics don't map onto American politics very well; plus it was (still is, I assume) in Russ./Ukrainian.
http://maidanua.org/ (I just looked at the site ... much less Russian there than before.)