It's an interesting list, candidates from red states like Kentucky, Idaho, and North Carolina to swing states like Florida and Oregon to blue states like Maryland, Washington, and New York.
There will be more sign-ons, and Republicans are having a tough time dealing with the framing, veering from attacking the plan as too liberal to having their moderates basically agree with it (while voting against the specifics in the plan, of course).
Meanwhile, 50 military leaders led by Anthony Zinni just called for a strong investment in nonmilitary tools to reorganize our national security. The framing works quite well, because changing the conversation around national security makes a lot of sense at this moment in history.