Go ahead and admit it, you would have been stumped if the answer wasn't in the title, right?   There isn't much a Democrat President-elect, an old white Republican war veteran and an insane actor could all have in common, but they do, according to the group Sense About Science which seeks to promote scientific accuracy.

It's scientific illiteracy.

Their Celebrities and Science Review 2008 pulls out the choicest bits of non-supported science data and holds them up for all to ridicule.  So let's go to it:

Barack Obama:

We've seen just a skyrocketing autism rate," said President-elect Obama. "Some people are suspicious that it's connected to the vaccines. This person included. The science right now is inconclusive, but we have to research it," he said.

It is?  If, by inconclusive you mean 'we don't know so I will blame something I read about one time' then I guess it is.

Don't get all excited, Republicans.   Your guy John McCain did the same thing:

 "It's indisputable that [autism] is on the rise among children, the question is what's causing it," he said. "There's strong evidence that indicates it's got to do with a preservative in the vaccines."

Oprah Winfrey got tagged for promoting a sugarless diet ("mind meals") that claims will 'detoxify' your body.  

Actress Julianne Moore has endorsed "highly trained medical leeches" which make you bleed. 

Who knew blood was a toxin?  Celebrities, that's who!

These are just a few.   You can read the entire Celebrities And Science Review 2008 here.