The best analysis I've read by far can be found over at Huff Post. Of course it has a liberal slant but I think the points made are valid. And not just a little bit humorous.
It's one thing to discuss how unqualified Sarah Palin is. That's a national matter and huge. But on a grassroots political level, her nomination takes away the Republicans' ONLY weapon in the campaign - calling Barack Obama inexperienced. They haven't even been trying to run on the issues, or on the eight-year record of George Bush, which John McCain has supported almost 95% of the time. They've only been running on the faux-issue of Barack Obama's experience of 14 years in federal and state government. Yes, Sarah Palin is merely running for VP, not president, but with a 72 year-old candidate with a history of serious medical issues, this is who they're saying is able to step in as president in a heart-beat. She has so little experience that she makes Sen. Obama look like FDR, Winston Churchill and Julius Caesar combined. So, the Republicans pulled the rug out from under themselves. They have no issues. The economy? Housing? The national debt? Education? The Environment? Iraq? Afghanistan? Nothing. All they have is "Dear Democratic women: please pretend our VP candidate is Hillary Clinton. Just forget that she's pro-life. And against most things Democrats stand for."
Because if the hope for John McCain is to get women to vote for him who otherwise supported Hillary Clinton - if anything could get Hillary Clinton campaigning in full force and fury...this is it. She likely would have campaigned hard, but it's in Hillary Clinton's best interest to be the leading voice for women, and the leading woman candidate for president in the future, so having another woman as the potential Vice President (and potential President) is a significant challenge to that. The Republicans just opened Pandora's Box and brought Hillary Clinton roaring to Barack Obama's side on the Democratic train. And Bill Clinton, too.
(P.S.- there is no mention of the daughterteenpregnancy debacle.- I agree with Obama on this one- people's families, especially kids, are off limits. Although I will say that this just might could be where abstinence only sex ed gets ya. I'm just sayin'.)