Bob Wright connects some dots:
According to Lara Friedman of Americans for Peace Now, the resolution got 15 Democratic supporters only "after days of intense AIPAC lobbying, particularly of what some consider 'vulnerable' Democrats (vulnerable in terms of being in races where their pro-Israel credentials are being challenged by the candidate running against them)." What's more, even as AIPAC was playing this hardball, the bill's sponsors still had to tone down some particularly threatening language in the resolution. But, even so, the resolution defines keeping Iran from getting a nuclear weapons "capability" as being in America's "vital national interest," which is generally taken as synonymous with "worth war."
The Dish 