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Perhaps you’ve heard of the GOP’s 11th Commandment — “Thou shalt not speak ill of any fellow Republican.”

According to legend, it originated during Ronald Reagan’s 1966 campaign for governor of California. And, as you may have noticed, it is flagrantly violated during every hard-fought Republican primary, such as the current, six-candidate race for the Illinois Republican gubernatorial nomination.

In fact, many of the candidates in that field seem to believe in a 12th Commandment — “Thou shalt not speak well of any Democrat” — that trumps the 11th.