America's first black president was sworn in for a second term today, on the national holiday dedicated to Dr. Martin Luther King, Jr. Barack Obama's traditional call for unity and equality echoed King's words at the same time he acknowledged what he called, "skepticism of central authority." He renewed commitments to Medicare, Medicaid and Social Security, promised response to climate change and emphasized the equality of gay Americans. Did he reach out to Republicans or challenge them to more political conflict?