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By all accounts, Mitt Romney won what may be the last Republican presidential debate. Little good it will do him if in the process he suffers the loss of the general election.

Romney's performance on Wednesday in Arizona was both adequate and alienating. Spraying out a fusillade of negative research, he oppo-bombed a flummoxed Rick Santorum. Mitt even had the nerve to attack Rick for endorsing Arlen Specter, his pro-abortion-rights GOP Senate colleague from Pennsylvania, for re-election in 2004. Santorum lacked the minimal deftness to respond that Romney himself was in favor of abortion rights back then. The Massachusetts governor who has morphed into a reborn Michigander pressed on: The author of RomneyCare accused Santorum of being responsible for ObamaCare because Specter...