Roberta McCain, the mother of the late Sen. John McCain, celebrated her 108th birthday on Friday. Her granddaughter, Meghan McCain, tweeted out the news. "Happy 108th Birthday to my nana Roberta. You are our matriarch," the conservative co-host of ABC's The View said. "Completely ageless, classic, lovely, strong, smart, sarcastic, irreverent and all things I love in this world. We are so grateful for you." McCain, 35, also shared the secret to her grandmother's long life on The View after host Sunny Hostin asked: "Have you ever asked her what her secret is to longevity?" "She said, 'A sense of...