Agree. I cut off daily visits to news / political sites six months ago. I'm less stressed and I get more work done. The other day I saw more headlines about the pending doom from the collapsing Greek economy. That doom has been pending any day now for an awful long time.
Yeah, you may not notice how ridiculous cable news is if you have it on everyday -- it becomes "normal".
But try not watching it for a few months and then turn it back on - you'll notice that it sounds very much like a bunch of 7th graders bickering in the cafeteria.
Everything will be alright, there will be ups and downs, but we'll get through them all the same.