Spence would have followed up with a Spencism - maybe something along the lines of:
While wearbars on rocks may on occasion smooth down to ice like qualities that on a rare chance might enhance your exposure to peril or injury, 4 out of 5 experts possibly agree that the rock will look better and that had McCain been elected President you would still likely fall.
You don't want to be so specific on the number of experts. Just assert it like it's fact everybody already knows.