It seems to me that if your staffers have not made the case to you already, you should fire them all and get competent aides who can actually help you figure out what you need to do to help the country and keep your seats. If, and sadly it's not that improbable of an if, a few of you Senate Democrats decide to jump onto the GOP filibuster and say "but now isn't the time to raise taxes on anyone!" then you have assuredly handed control of the Senate and possibly the White House over to the Republicans come 2012. Your defection from your fellow Democrats will be seen as proof both to the GOP and the American public that tax cuts for the middle class only is wrong.
So instead of being gutless wimps and voting to prevent the tax rates on the richest 2% from returning to where they were under President Clinton (boy were those bad economic times, right?) dig deep and find some courage. Go borrow some from Bernie Sanders or Russ Feingold if you need to, and then vote FOR the middle class tax cuts. Even if the bill doesn't pass because you can't get a single Republican senator to help out the middle class, USE THAT! Plaster your states with advertising denouncing the GOP for raising taxes on the middle class. Get on CNN, MSNBC and even FoxNews and chastise your Republican colleagues for forcing a tax hike on the American people. BUT do not cave in before forcing them to vote no on tax cuts for the middle class.