No reason to panic. These were extremely low turnout elections in a state with a GOP supermajority where the people they were replacing were moral reprobates (hence, spanking the local party). As soon as they start voting moonbat, they won’t survive a regular election in 2018.
Oklahoma Democrats are also an entirely different breed than national Democrats. Remember Rep. David Boren? He was utterly sane and far more conservative than your average northeast Republican. He only lost because he refused to switch parties like so many other southern Democrats did.