WASHINGTON - Oregon Sen. Jeff Merkley and six other Democrats charged Tuesday that modern political campaigns - and democracy itself - are threatened by a pair of "awful" Supreme Court decisions that can only be fixed by changing the U.S. Constitution itself. The senators said during a news conference that adding a new provision to the Constitution is necessary if Congress wants to nullify a 1976 ruling that said campaign spending was the same as free speech and a 2010 ruling that removed all limits on campaign spending for special interests, corporations and labor unions. "In the mid-70s the activist...