Chris Wallace should probably stick to grilling Republican presidential candidates. Somehow, during a radio interview with conservative host Mike Gallagher on Friday, the Fox News Sunday host got pulled into a discussion about former American Idol star Kelly Clarkson’s weight. The two men were discussing Little Caesars’ bacon-wrapped crust pizza when Gallagher brought up “fat shaming.” “Have you seen Kelly Clarkson? You know the singer, Kelly Clarkson?” Gallagher asked Wallace. “Holy cow, did she blow up.” At first, it seemed that Wallace was going to avoid joining in on this bizarre line of questioning, saying he thinks Clarkson has “got...