Jonah Goldberg's tendentious history of liberalism.
Among the liberals I know, you don't, in fact, hear the word fascist bandied about much, and if somebody blurts it out to describe contemporary conservatism, the most common reaction is a rolling of the eyes. It's a provocation rather than an argument, much overused by the left during the 1960s and now mostly absent from mainstream political discourse. The only exception would be the term Islamofascism, adopted mainly (though not entirely) by the right to describe the reactionary views of violent Muslims intoxicated with hatred for the West. Weirdly, that word doesn't appear once in Liberal Fascism.