Mike Plante could hardly believe his eyes when he discovered how much his health insurance premiums will go up next year. The 64-year-old public relations consultant is paying $400 a month. But this will jump to $1,965 -- a nearly 400 per cent increase -- if he renews his existing plan. "Me and some 65,000 other West Virginians are about to be run off a cliff," he said. Plante is one of nearly 22 million Americans enrolled in health insurance under the Affordable Care Act -- or Obamacare -- who will see their premiums soar next year if their tax credits expire as expected on December 31. "It's a full-blown crisis," said Mike Pushkin, chair of the West Virginian Democratic Party. "Ours will be one of the states hardest hit by the failure of Congress and the Trump administration to extend these subsidies."