It's a pretty intense claim that the Daily Kos is currently making about Trig Palin not actually being Sarah Palin's son. It sounds like the kind muck-raking BS that is a hallmark of American elections. I wasn't ready to buy into this at all. But they build a case that is pretty airtight, and frightening. It seems as though the kid is actually her granddaughter and she has been lying about it.
I won't claim that it's absolutely true, because I didn't do the research. But this is a tough case to argue against it.
You can read the article here.
Also here is a photo of Sarah Palin when she was actually pregnant with one of her earlier spawn.