Party chairman's optimistic after upstart candidates take primaries WASHINGTON (MarketWatch) -- Democrats face a tough battle, but voters will ultimately reward President Barack Obama's party at the polls this election season, the chairman of the Democratic National Committee predicted Wednesday."Americans continue to be very anxious about the economy. Many continue to feel the bite of the deep recession from which are only beginning to emerge -- and they are holding incumbents of both parties accountable in a tough time," DNC chief Tim Kaine said in a speech at the National Press Club.