Mark Halperin reports on what is likely the real reason behind Joe Biden's return to the public spotlight in recent days, which some have suggested is an attempt to "fight back" against damning revelations about his cognitive decline. "Biden, Inc., needs a source of revenue," he said, citing a source familiar with the Biden family. "The trough is empty, the spigot has shut down. They need a way to get back in the game to make big money to have the grandchildren fed and clothed and flown first