Time to tap the great resource that is the Philosophy Forum. I read a lot of material from the 18th and 19th century. In so doing, it is apparent that the ideologies of the right and left wings are very fluid, in a way that I think reveals they are not motivated by any kind of overall intuitive ideal, but are in fact highly opportunistic.

What I'm looking for is a book that critically analyses the history of the liberal versus the conservative, preferably beginning with the Whigs and Tories and continuing to present day.

Recommendations?