ABC News -- ABC News Rick Klein reports: As Democrats brace for what could be a rough Election Day , the head of Democrats House campaign efforts is downplaying the national implications of the days marquee contests , in New Jersey, Virginia, and upstate New York. But if the Obama agenda isnt on the ballot this year -- it sure will be next year, Rep. Chris Van Hollen, D-Md., told us on ABCNews.coms Top Line today. If Democratic turnout is down today, what it tells is us we need to make sure that between now and a year from now we take actions both on the campaign side as well as whatever policy efforts we need to undertake, to make sure that all those voters understand that the success of the presidents agenda --- the success of the Obama agenda will...