Ossoff is the slight favorite headed into Tuesday's special election.
Predicting an election this close is risky. However, polling trends show as of today that Ossoff has a slight advantage, and future polling data may prove to be consistent.
Polling can be a predictor. For now, the following from Real Clear Politics appears to be on the money with this special election.
...polls have error margins, and that those error margins attach to *both* candidates. So if Ossoff were at 50 percent, and Karen Handel at 46 percent, and polls had four-point error margins, we wouldn’t be surprised to see polls showing Ossoff with 51, 50, 47 and 50 percent of the vote. Nor would we be surprised to see Handel with 44, 47, 47, and 47 percent of the vote. In fact, this is exactly what we see.
In other words, this variance is perfectly consistent with a small but stable Ossoff lead (since early May, in fact). Of course, we should also remember that there are sources of poll error other than sampling error, and that polling of special elections tends to have big errors as well. Ossoff goes into the election as a favorite, but not an overwhelming one. Real Clear Politics, David Byler