Hillary Clinton lost Wisconsin because of black-voter suppression.

It is only with the Black vote that a Democratic candidate can win.

The first says that a specific candidate did actually lose because of this factor. The second says that any candidate of a particular party must inevitably lose because of this factor.

True, Democrats generally do better with minorities than Republicans do. So a Democrat who doesn't get the minority vote - whether through personal failings or voter suppression - is likely to have a harder path. But you can say that about virtually any interest group.