There was the period last spring when Mitt Romney claimed while campaigning in Iowa and New Hampshire that he had been a hunter “pretty much all my life,” only to have to admit later he had seriously hunted on only two occasions.

Then there was the endorsement Mr. Romney claimed on NBC’s “Meet the Press” last Sunday that he received from the National Rifle Association while running for governor of Massachusetts in 2002, when it turned out the group had never endorsed him.

Mr. Romney’s latest concession is that he only “figuratively” saw his late father, George, march with Martin Luther King Jr., something he claimed in his highly publicized speech about his Mormon faith earlier this month. Some publications have raised doubts that the event ever happened at all.