Watch Dr. David Scheiner in this excerpt from his appearance on CNBC’s “Closing Bell” with Maria Bartiromo on June 28, 2012. Dr. Scheiner, an internist, was President Barack Obama’s personal physician from 1987 till 2008 while the latter was based in Chicago. He is a member of Physicians for a National Health Program and an outspoken advocate of single-payer health reform. The other person being interviewed in this segment was David Cordani, CEO of Cigna, the giant insurance company.