Saying there’s no way Democrats can keep control of the House, Ireland’s largest bookie on Wednesday said it has already paid off all bettors who wagered the GOP would capture the chamber.

“In our opinion this race is well and truly over with nothing short of a miracle stopping the Republicans taking down the House,” said Ken Robertson, communications manager for Paddy Power, the Irish bookmaker.

Mr. Robertson said the odds had tipped so much in Republicans’ favor it made no sense to continue taking bets. In July Democrats were favored 8-11 to keep control, but by Wednesday the GOP was favored 1-50, meaning it would take a bet of $50 would win just an addition $1.