President Bush ran for office as a "compassionate conservative." And he continues to nurture his conservative base — even issuing his first veto this week against embryonic stem cell research. But lately his foreign policy has come under fire from some conservatives — including the father of modern conservatism. CBS Evening News Saturday anchor Thalia Assuras sat down for an exclusive interview with William F. Buckley about his disagreements with President Bush. William F. Buckley's Stamford, Conn., home is a tranquil place that allows Buckley to think and write, and spend time with his canine companion, Sebastian. "He's practically always...