Palin's great idea: Claim Bristol's baby as her own

Okay. Just read this excerpt from Vanity Fair's interview with Levi Johnston. Now, this is Levi talking about his baby and the scheme contocted by the grandmother of the baby:

Even before Palin became John McCain’s running mate, she seemed worried about what a grandchild would do to her political career. According to Johnston, she had a plan for how to handle her daughter’s unexpected pregnancy.

Sarah told me she had a great idea: we would keep it a secret—nobody would know that Bristol was pregnant. She told me that once Bristol had the baby she and Todd would adopt him. That way, she said, Bristol and I didn’t have to worry about anything. Sarah kept mentioning this plan. She was nagging—she wouldn’t give up. She would say, “So, are you gonna let me adopt him?” We both kept telling her we were definitely not going to let her adopt the baby. I think Sarah wanted to make Bristol look good, and she didn’t want people to know that her 17-year-old daughter was going to have a kid.

Great idea. (But, hadn't we heard this idea somewhere before?)