In that decision, the Supreme Court provided a three-part test for determining if material was obscene. If a work satisfies all three of these tests, then a court may determine it to be obscene. Notice that the three-part test above does not specify which media the work might be viewed, created, transmitted or stored in. This means that every time a new technology that allows expression is invented, the laws governing obscenity are automatically in force for it. These are all also Constitutionally-protected expression, although there currently exists no legal definition for what constitutes this type of speech.
Obscene material is currently legal in electronic form.
The CDA is needed to bring electronic networks in line with telephone and broadcast media. Obscene material is already illegal in any medium, existing or in the future. No new legislation is needed. The CDA would fix that. There's nothing for the CDA to fix.