On election night in Texas, the impossible became possible. Democrats won the governor’s seat for the first time since the 1990s and appear to be on their way to securing control of the state House too . Those massive, unexpected wins have now opened the window for a major policy change that has long been closed: expanding Medicaid to more than a million low-income Texans.

The Affordable Care Act offers generous funding for states to expand Medicaid eligibility to 133 percent of the federal poverty level , which is about $21,000 for one person or $44,000 for a family of three. But the Supreme Court ruled in 2012 that states should have a choice about whether or not to accept the expansion. And even though many other GOP-led states decided to adopt it, Texas is one of the 10 that have steadfastly refused to extend Medicaid coverage to many of its poorest citizens — and it’s by far the biggest.…