Sarah Palin didn't retreat. She reloaded. And she proved, again, that she is a ruinously incompetent politician. Over the weekend, liberal pundits overeagerly speculated that she may have inspired the shooting of Rep. Gabrielle Giffords (D-Ariz.). After learning more about alleged shooter Jared Loughner, many of those same commentators restrained their criticism of the former Alaska governor, and polls showed that Americans are skeptical of any connection. People recognized Palin had been unfairly implicated in the Arizona massacre. She didn't even have to mention it in her response to the tragedy and the resulting debate. Everyone would have been thinking...