I have written many times in this space that I oppose any criminal prosecution of prior-administration officials on torture or other issues relating to the Iraq War and the war on terrorism, especially those CIA interrogators who relied in good faith on the instructions of policymakers and the legal opinions issued by Justice Department senior officials. I have agreed with President Obama on the need to look forward, not backward. But I have changed my mind about the need to indict former Vice President Dick Cheney for complicity in illegal torture. [Editor’s Note: Read Lanny J. Davis' columns in The...