But the bill that could come due in 2019 or 2020 if Obamacare is repealed is far more significant. Currently, the federal government pays 98 percent of the $1.2 billion annual cost to insure 201,000 poor adults in Connecticut who used to make too much to qualify for Medicaid. Under Obamacare, the federal share was going to gradually shrink until it was a 90 percent match — far more generous than the 50 percent match Connecticut receives for another 555,000 residents covered by Medicaid.