I concur with BooMan on being a bit mystified about the relative lack of passion we're seeing on this one from progressives.
progressives have become almost completely disengaged from the issues of nuclear disarmament and non-proliferation, and are far more invested in other issues that are important but, let me say, of less monumental importance. I don't want to engage in a war of "my issue is more important than your issue," because the Senate is debating a range of important issues that include progressive taxation, the budget, gay rights, immigrant rights, nuclear issues, and bilateral relations with Russia. I will just say that I am not happy that there is almost no evident interest or angst from the progressive community about the outcome of the START ratification effort. When I was coming of political age, the left was deeply invested in nuclear issues
It reminds me a bit of the obsession progressives demonstrated about the public option during health care reform - all while things like the expansion of Medicaid went practically unnoticed. I find it interesting (to say the least) to watch how these priorities are developed.