"Our team is prepared to work with you," Obama said, in a message directed at GOP governors.
Expanding Medicaid could save his state $400M over the next two years.
States that might have pursued an expansion stayed in GOP hands.
By persuading a Dem to resign, Republicans regain Senate control and can block expansion.
They warn vulnerable Americans could face "significant delay" when accessing treatment.
It raises more questions than it answers.
State decisions on Medicaid expansion are producing separate and unequal healthcare systems.
In many states, Republicans are showing a spirit of pragmatism about Medicaid expansion.
The polling firm found more people are insured in states that embraced ObamaCare.