My two cents: Yes, eminent domain is often used by the politically connected against those who lack the connections, but connections dont always simply follow class. We in Atlanta, for example, even build highways through well-to-do neighborhoods.
Any reader of John Locke would have to concede that natural property rights are civilized and limited once we enter civil society, and that the principal limitations are to be justified on behalf of the public good. The use and abuse of eminent domain should be regulated, above all, by a representative and hence responsive legislature and secondarily by a judiciary that upholds the Constitution. At the same time, Lockes emphasis on the natural roots of "civil" property rights ought to educate citizens and political leaders about the intimate relationship between property and individuality. We are, according to Locke, individuals who express ourselves largely through our labor, which is "reified" in property. If the smart undergrads who made their way into Yale Law School, and their professors, paid as much attention to the roots of classical liberalism as they appear to have done to Marxism and neo-Marxism, perhaps they would be able to engage Kens arguments without resorting to ad hominem attacks.