From a STRATFOR brief about START:
In the end, the issue boiled down to this. START was marginal at best. But if President Barack Obama couldn’t deliver on START his credibility with the Russians would collapse. It wasn’t so much that a New START would build confidence as it was that a failure to pass a New START would destroy confidence. It was on that basis that the U.S. Senate approved the treaty. Its opponents argued that it left out discussions of BMD and tactical nuclear weapons. Their more powerful argument was that the United States just negotiated a slightly modified version of a treaty that Ronald Reagan proposed a quarter century ago and it had nothing to do with contemporary geopolitical reality.
Passage allowed Obama to dodge a bullet, but it leaves open a question that he does not want to answer: What is American strategy toward Russia? He has mimicked American strategy from a quarter century ago, not defined what it will be.That roughly approximates my feelings, no? Close enough.