The first is an article by the conservative Republican, David Frum, When Did the GOP Lose Tough With Reality? The second by the liberal-leaning commentator, Jonathan Chait, When Did Liberals Become So Unreasonable? Frum's piece is a thinking man's repudiation of the extremism that has driven conservatism to the point of its current insanity. Chait's is a fascinating historical study of the way the Democrats have treated their presidents--a pattern of disenchantment and rejection that repeats itself and has reached its counter-productive climax with Obama.
These are both substantial articles; they require a little time and attention. But I found them to be absorbing, well-considered, thoughtfully critical and refreshingly intelligent. I hope that you might want to read them, too.