Well, to be fair, a co-worker of mine* also likes Twilight, but mostly from the brain-candy POV. (At least, that's what I gather since she also owns the 'And then Buffy staked Edward' T-shirt.)
Now, if Mister Romney takes it more seriously than 'something that's not work related and doesn't require much thought, that I can talk about with my granddaughter', then I'll worry. But, given my general opinion of anyone who is able to get elected for a state office by the Republican party**, I think I'll hold off on critiquing Mister Romney for his taste in reading material when I have so many more things I can critique him on.
* She got a MS in high energy physics, left and now is working on her PhD in astronomy by cataloging rocks the Mars Rover Spirit saw.
** Especially when they then have to go around disavowing half of what they did when they go national because they were elected in Massachusetts, and the average Republican is farther right than that.