From Jonathan Freedland at The Guardian:

Where does that leave Democrats? It suggests that in November, and again in 2008, they should train their sights on the real enemy. It does not pay to get into a fight with "values voters". More important is to make a values case of their own, putting the moral, even religious, arguments against poverty, environmental despoliation and a greed culture. That could even work as a wedge issue - splitting "values" Republicans from boardroom ones. As for the rest of us, we shouldn't be distracted by a stunt on gay marriage. We should know exactly what it is we are up against.