What Authorizes Congress' Power to Regulate Speech?

[RJLipkin at aol.com]

If Congress' power is  constitutionally limited to its enumerated powers, 
even if these powers are  construed liberally, where does Congress' power to 
regulate speech derive?  Judicial opinions often address the constitutionality of 
a congressional act  regulating speech by going directly to the First 
Amendment issue without ever  identifying the constitutional provision authorizing 
such regulation. Why  is this? I welcome an explanation.  Thanks.
 
Bobby
 
Robert Justin  Lipkin
Professor of Law
Widener University School of  Law
Delaware
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