Mark Halperin; Governor Martin O'Malley; Mayor Antonio Villaraigosa

Mark Halperin previews the 2012 Democratic National Convention and what the party hopes to accomplish in showcasing its presumptive nominee, President Barack Obama. Martin O'Malley, governor of Maryland, makes the case for the Democratic Party's vision for America. Antonio Villaraigosa, mayor of Los Angeles, defends President Obama's first term ahead of the convention, in Charlotte, North Carolina.