The article talks about Democrats deliberately scheduling local elections at times when it's harder for people to make it to the polls: a weekday that's a separate day from a national election when people might be taking time off work to vote anyway. I would call that fairly substantial; that sort of "make it hard for people to get to the polls" thing is _exactly_ what lots of people rightly complain about Republicans doing. And it is in fact quite widespread; as the article notes it's going on in 44 out of our 50 states.

Update: For the rest, if you're looking for exact counterparts to your list of talking points, I don't have the time to look up references right now.

If you just want a general example of malfeasance, look no further than the systematic way the Democrat-dominated Illinois legislature discriminates against third-party candidates by requiring different numbers of petition signatures for different parties to get on the ballot at all. I have no doubt whatsoever that they'd do this for the Republican party too if there were just slightly fewer Republican voters in the state.

This sort of thing varies by location, of course; my experience in Massachusetts has been that there is a lot less of that sort of thing going on than in Illinois. We do have the election-scheduling thing in Massachusetts, though...