Not a big win by any measure and very few would even call it a win. Coming in a distant second is not a win. The Republicans manage to narrowly avoid a big loss is more like it.
President Trump, or should I say the realDonaldTrump, tweeted that we had a “BIG “R” win with runoff in Georgia”. You’d think that might mean they had won the runoff in a big way. In reality it means that one of the Republican managed a distant second and qualified to be in the runoff. And this is in a very Republican district.
Democrat Jon Ossoff received 48.1% of the vote, failing to meet the 50% + 1 needed for outright victory with no runoff. Republican Karen Handel came in a distant second with 19.8% of the vote. And any second place, even a very distant second place, gets you in the runoff. Those Trump favored came in further back.
So hardly the big win the President would lead us to believe.