Will books ever really change someone's mind?

A lot of books written on political topics get reviewed as “preaching to the choir”. But is there really a book that would convert the rest? Wouldn’t those with right leanings be unlikely to pick up the book in the first place, and even more unlikely to change their minds no matter what the book said? Can you write a book that will change the way people think and feel about a certain issue, or are people pretty much just set in their ways, and your best shot is just to better inform the choir?