Book excerpt: For nearly 40 years, Ronald Reagan's vision--small government, lower taxes, and self-reliant individualism--has remained America's dominant political ideology. The Democratic Party has offered no truly convincing competing vision. Instead, American liberalism has fallen under the spell of identity politics.Mark Lilla argues with acerbic wit that liberals, originally driven by a sincere desire to protect the most vulnerable Americans, have now unwittingly invested their energies in social movements rather than winning elections. This abandonment of political priorities has had dire consequences. But, with the Republican Party led by an unpredictable demagogue and in ideological disarray, Lilla believes liberals now have an opportunity to turn from the divisive politics of identity, and offer positive ideas for a shared future. A fiercely-argued, no-nonsense book, The Once and Future Liberal is essential reading for our momentous times.