WASHINGTON -- Thousands of Realtors gathered around the Washington Monument today in a demonstration of the National Association of Realtors' political clout.NAR -- fourth on the Center for Responsive Politics' "Heavy Hitters" list of top political donors, with $41.9 million in political donations since 1989 -- upped its game last year, approving a $40-a-year dues increase for its nearly 1 million members to raise $80 million in "soft money" for political advocacy at the local, state and federal level this year and next.Although one poll showed more than 80 percent of Realtors opposed a dues increase, NAR leadership said the move was necessary because the Supreme Court's decision in Citizens United v. FEC would open the floodgates for...