I obviously don't know for sure what conversations Gov. Palin had with her family, and in particular with her daughter Bristol, before giving Sen. McCain her decision. But given this history from 2004 — when a veto from Track stopped her from running for a U.S. Senate seat she might very well have won, in which case she would have become Barack Obama's Senate classmate — I would wager a very, very large sum of money that Bristol Palin was given a veto right again. I would wager that she was warned, in detail, about the certainty that her privacy would be invaded in a sickening, vicious manner.
And I would wager that Bristol Palin must have said: "Go ahead, mom. Tell Senator McCain 'Yes.' I know what's coming, but my baby and I will be okay."
Which makes Bristol Palin a very brave young woman indeed.