Stop steeping yourself in self-affirming commentary. If you fancy yourself a left-leaning liberal progressive, please resist the urge to loiter here in the familiar. Do yourself a favor and step outside the box.You would be much better served exploring the many curiosities of conservatism.
That said, if you are just budding your own personal political philosophy, go ahead and take a look around. But, beware of getting bogged down in the tit-for-tat, or being boggled by the endless criticism and contradictions.
You might take the leap straight over to the Political Logic and find the plunge much more refreshing.
If you are looking to dig a little deeper into the language and ideals of progressive politics, you just hit the jackpot.
Rather than pontificate my own perspective, here you will find a variety of hand-selected, carefully curated links to many well articulated pros and cons of left-spectrum politics.