Mark Halperin tells Andrea Mitchell the factors on which a potential budget deal hinges.

Mark Halperin tells Andrea Mitchell Obama has “public opinion” but compromise hinges on “the Gang of Six, the level of trust the president can build with Mitch McConnell and then John Boehner, how to sequence different parts of this and whether a big deal can come together in time for the debt ceiling, how recalcitrant House Republicans will be.”