I read the piece carefully and my conclusion is that it was written carefully. I don't think it is wildly biased.
That said, let's examine the only two overtly partisan quotes in the piece.
The organized left's efforts to, quote unquote, register voters - I call them ringers - have created these problems. -James P. Trakas, the Republican chairman in Cuyahoga County
I think it's sick that these Republicans are up to dirty tricks at the polls. I believe thousands of votes were lost in 2000, and I want to make sure that doesn't happen in Ohio. -Ronald Magoteaux, 57, a mechanical engineer
The first, by a labelled Republican official, sounds overly accusatory in the context of the piece; but it is pretty well based in fact.
The second, by an unlabelled person, designated as volunteer poll watcher acting out of concern for new voters (awwwww, isn't that sweet) makes a wild unfounded accusation of dirty tricks.
There is bias in the piece.