"A Political Philosophy in Public Life" is a unique piece of political philosophy. The book's main virtue is it provides the reader with cases for both the theoretical advantages to republicanism, as well as the practical applications of it by a government (Spain) committed to the theory's principles. The book is well-organized, and starts with the political conditions in Spanish society that were conducive to a shift towards republicanism, and how Philip Pettit became involved. This outline, as well as the interview with Prime Minister Zapatero, both illuminate how and why the Spanish state, as well as Zapatero, were well-suited to pursue the application of such a democratically-oriented political philosophy. I was impressed by Zapatero's keen interest in adhering closely to the ideal conditions as laid out in Pettit's work, given that philosophical consistency is often a challenge for any world leader, let alone one interested in reducing bureaucracy, or arbitrary domination, as Zapatero is.
The two main philosophical contributions are strong as well. Pettit first provides a brief overview of republicanism. This section is particularly beneficial for those without any prior reading on the theory, but it also distinguishes republicanism from other competing theories of government, like the liberalism of John Stuart Mill and Robert Nozick's brand of libertarianism. Also, in the final chapter, Pettit and Martí argue that a political philosophy must provide guidance for its successful implementation, or as they say, "it should strive to serve in a public role." They list three conditions: political philosophies must be shareable, realistic, and energizing, and they argue the case for republicanism for each. I found this last section to be beneficial in illuminating how a political theory can be implementable, but also how it can serve the public's interests democratically.
The main drawback of the book is that the content is of a high quality, but the book itself is a bit short (about 160 pages with 30+ pages of notes/bibliography), particularly for $29.95. However, it really is a unique book, and worth reading if you would like to see how philosophers can positively influence public policy.