WASHINGTON — Howard Dean is no longer screaming — he's scheming. The failed presidential candidate whose howling adieu to the Iowa caucuses helped seal his fate as a presidential candidate is plotting to overhaul the Democratic Party. Borrowing ideas from President Bush's re-election campaign, Madison Avenue and his own Internet-driven White House bid, the Democratic National Committee chairman hopes to drag the party into the 21st century. "What I'm trying to do is impose a system and run this place like a business," Dean said during an expansive interview in his office overlooking the Capitol. That vision would be welcome...