Book excerpt: What's in your coffee cup: Starbucks or Dunkin' Donuts? Hetherington and Weiler explain how even our smallest choices speak volumes about us-- especially when it comes to our personalities and our politics. Liberals and conservatives seem to occupy different worlds because we have fundamentally different worldviews: systems of values which shape our lives and decisions in the most elemental ways. If we're to overcome our seemingly intractable differences, we must first learn to master the psychological impulses that give rise to them, and to understand how politicians manipulate our mindsets for their own benefit.