Bristol Palin is five months pregnant. The McCain camp claims they knew...
...great judgment, McCain ;-)
In seriousness, I read the rumors that she (rather than her mom) had been pregnant with Trig with a lot of skepticism but a little bit of hope from a purely political perspective: I thought that such a scandal would be good for November. After talking to a friend of mine, I started to realize that the RR would just say, "It's better than an abortion." The same probably applies here.
The absurd policies of the Religious Right bear rotten fruit: 1 in 4 teenage girls who are sexually active have at least one STD. The rates of teen pregnancy are rising again after years of decline during the Clinton years with comprehensive sex ed. There's also a sad race gap: more than one half of black girls have one, compared to only 20% of whites and Latinos. The teenagers themselves aren't in the least surprised. See this or this piece of mine for more stats related to "abstinence only" education and abortions.
See this excellent item on the RR's policies of "marriage promotion" as well.