Thanks for that second, B&W video - the '64 press conference - one I hadn't seen before. It's interesting to contrast her maturity and confidence, or lack of them, in the press conference video with the first, the Cavett interview. Some of it clearly was her poor command of English to be sure. But still. It was 14 years apart and it's like watching two completely different women.
And at the 4:00 minute mark:
Dick Cavett: "....the last poll showed 73 per cent believed in a conspiracy. Do you think it will ever go away?..."
Marina: "No, it's not because the conspiracy really exists but it's people who wants (sic) to believe that way....no matter how honest you are..umm no matter how hard you try to prove the truth some people just close their minds to it and believe their own way..."