Which u. s. supreme court case argued that the primary election was "in no real sense part of the manner of holding the election"? it cleared the way for southern states to discriminate against african americans?

The best answer for this question would be:

Newberry v. United States

The involvement of this campaign was the “federal campaign expenditures” law. This gave a quote that there was no necessity in holding the election, therefore allowing the southern states to discriminate against the blacks.

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