You can tell it's good news because it's obviously good news, but also because the brigade of conservative writers who comb the news for every last Obamacare glitch in less cooperative states have been pretty quiet about it.
But in addition to auguring well for the law and suggesting its detractors have been blowing implementation problems out of proportion, I think this news underscores the strategic importance, from the administration's point of view, of getting the ACA right in California in particular.
For those following ACA news closely, I'd almost say forget everything you hear about the law outside of California.
California is huge, geographically and population-wise. Yet it's better positioned than almost any state in the US to implement Obamacare smoothly -- Democratic leadership, big activist networks, etc. If they can make this work, then a). the law will have a huge head start toward meeting it's national coverage goals and b). it will serve as a model for every other state in the country for how to make it work.
More to the point, all the states trying to make the law fail will look very stupid and terribly craven if California pulls this off. Their predictable claims that Obamacare is all screwed up won't be very persuasive if a giant, historically mismanaged state like California can make it work well.
If it fails in California, though, that's a disaster.
Thus, my hunch is that both the administration and California officials are unusually invested in getting it right there, more so than in any other state in the union. The other side of that coin, of course, is that conservatives will be heavily invested in finding ways to undermine it. Perhaps that's why they've recently tried recently, and appropriately, to make issue of California's attempt to conceal its exchange's contractor spending from the public.
But if you're looking for an Obamacare bellwether, keep your eyes on California.