I would consider this a feeler, to gauge reaction.
If progressive bloggers pick it up look for more of the same.
It seems the liberals are about to get new marching orders, new talking points, even after some have been defending Ted Cruz eligibility out of habit.
If Cruz and Trump play this right - and if their followers stop the crap-slinging long enough to think about what the COUNTRY needs - Obama and his owners may really, really regret ever bringing this up...