People magazine (November 3, 2008 issue) gives Sarah Palin three chances to enlarge on her claim to be a "voracious reader" and three times she escapes:
People: What do you like to read?
Palin: Autobiographies, historical pieces--really anything and everything. Besides the kids and sports, reading is my favorite thing to do.
People: What are you reading now?
Palin: I'm reading, heh-heh, a lot of briefing papers.
People: What about for fun?
Palin: Do we consider The Looming Tower something just for fun? That's what I've been reading on the airplane. It's about 9/11. If I'm going to read something, for the most part, it's something beneficial.
I don't know if you have to be a reader to be President (although I did find myself liking GWB a little more when he said he was reading Tom Wolfe's I Am Charlotte Simmons, a terrible book I thoroughly enjoyed) but I am reflexively suspicious of someone who only reads "improving" books and claims to love reading. They are lying about one thing or the other.