FORT DODGE, Iowa  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 that he had seriously hunted only on two occasions.

Then there was the endorsement Mr. Romney claimed on the NBC News program “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 father, George, march with the Rev. Dr. Martin Luther King Jr., something he claimed in his highly publicized speech about his Mormon faith this month. Some publications have raised doubts that Mr. Romney’s father ever marched with Dr. King. But Mike Allen, a writer for the political Web site Politico.com, reported on Friday that he had interviewed two people who recalled seeing George Romney and Dr. King marching together in Grosse Pointe, Mich., in 1963.

Mr. Romney once said, in reference to misstatements by his Republican rival Rudolph W. Giuliani, “Facts are stubborn things.” But does he have his own problem with blurring the truth?