Idealism?? No one REALLY wants idealism. They want some form of what they perceive as pragmatism-in-their-own-interest.
For actual idealism: "Sermon on the Mount" and "Beatitudes" and "Parable of the Good Samaritan", author Jesus Christ, killed for Idealism, first century AD.
If you have steeled yourself with the above, and are warm and deep with your spirituality, you might try a perfectly horribly-written book called Ecotopia by Ernest Callenbach --- select those parts which you judge harmonious with the Gospel references. Dump the trivia.
Now buttressed by not only deep authentic morality, but also a rough blueprint for a human-level society based on sustainable principles, you might screw up your courage and read a really challenging book, Stranger in a Strange Land by Robert Heinlein, again keeping what your soul is large enough to contain, and tossing the rest.
With these threatening excursions into Idealism consumed and synthesized in your own systemic way [always with an eye on the two great commandments of Love], you might then read the Republican and Democratic platforms. You will then discover that you were born on the wrong planet.
