on the yellow line, you will crash. The middle of the road separates lanes of movement. It does not provide a place to drive, walk, or stand.
But a lot of this business of "moving to the political center" depends on your choice of metaphors. If you instead make it a three-lane highway of traffic moving in the same direction, for instance, with the right being the catatonic lane and the left being the aggressive asshole lane, the center lane can be a sensible route to your destination.
So here is the real problem with today's center-worshipping: Ever since Clinton became the Democrats' answer to the scorched-earth slash-and-grin Reagan legacy, the "center" has shifted to being a re-labeled section of the political right. Richard Nixon, who favored strong government support for full availability of health care, would today be considered an American Sandinista. If you treat people who want to drown government in the bathtub as mainstream conservatives, and if you treat people who accept private-sector control of public policy as mainstream centrists, you then define the very reasonable propositions of universal healthcare and bribe-free politics as extreme leftist positions.
Barack Obama, and the blinkered commentators who breezily praise his "move toward the center," have not looked at a freely-operating political compass in years. Had they done so, they would know that a man who is intimidated by thugs into betraying half his relatives instead of all of them is not a "centrist." He is a coward.