The problem with that is that in most cases, one of the two of you will be more talented and get more traffic, resulting in the other guy getting flamed by commenters, etc. For example Sean Hannity's show used to be "Hannity and Colmes", one right-wing and one left-wing commentator, and poor Mr. Colmes was just outnumbered and outgunned to the point that he quit.

It might achieve some popularity but the difficulty of determining correctness or bias or other things without bringing your own bias to the problem will of course mean that the stated goal is not what will actually be the end result.

Curious what would be considered left leaning and right leaning and whether or not an "equal time" approach might reflect a bias.

Correct...The only way around this that I see would be to allow voting in which the crowd would decide if the article would be in the correct column or not.