Democratic strategist James Carville during a Thursday podcast advised Vice President Kamala Harris to use pre-planned queries during her public speaking engagements. Harris has mostly stuck to prepared remarks since launching her campaign on July 21, giving just one sit-down interview and participating in a single presidential debate. Carville, on “Conversations with Bill Kristol,” suggested Harris field a mix of “planted” and unrehearsed questions to appear more impressive, without making it obvious she has prepared for some of the queries. “She could do a China speech, alright, and talk about how it’s an adversary but not an enemy, you know,...