Claire McCaskill’s advice to career relaunchers: Believe you can make it happen

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The former Missouri senator and MSNBC contributor reacts to the release of Mika Brzezinski’s newest Know Your Value book, “Comeback Careers.” She giver her advice for women over 50 who are looking to restart their career: “Don’t go at it with the attitude that, ‘I’m not sure I can pull this off.’”