My waist is 38, and I know there's no way my "stance" could be at wide as the Sinator claims his is!
Glad to see I'm not the only one who has asked this question. You wouldn't believe the flak I took when I dared suggest that Craig's "wide stance" claim was impossible and for the very reason you suggest. According to Craig, his pant waist was at mid-thigh and he spread his knees to "keep them from touching the floor." There is no way on Earth that Craig's "wide stance" excuse could hold, not unless he has an 80-inch waist.
BTW, all bathroom stalls at the MSP Airport (both terminals) are extra-wide. I checked.