Two-to-one: not quite what I'd call betting odds. Republicans don't actually have a 66% chance of taking the Senate, but the 64% chance they have in our latest forecast is closer to it than any other forecast we've done since we'd started. Previously Republicans consistently had a slightly better than even chance of winning, usually in the mid-50s. The lowest they had gone was actually slightly worse-than-even chances of taking the Senate:
