George Dishman wrote:
You seem to be suggesting the CMBR could be
redshifted light from galaxies. If so, that
has been ruled out because the spectral shape
is incorrect. Galaxies aren't black body
emitters. I thought Ned Wright had a graph
showing the deviation but I can't find it at
the moment.

That would be
http://www.astro.ucla.edu/~wright/stars_vs_cmb.html

It's in the FAQ

--Edward L. (Ned) Wright, UCLA Professor of Physics and Astronomy
See http:www.astro.ucla.edu/~wright/cosmolog.htm