Again, I think I answered my own question.
It seems that SSO only works for SSL connections and that the cookie is not 
sent over a non-SSL connection (firesheep?).

It looks like this is documented here: 
https://wiki.jasig.org/display/CASUM/Securing+Your+New+CAS+Server

"By default, CAS only sends the single sign on cookie (CASTGC) over secure 
connections"

Also, Marvin Addison said something similar here: 
https://lists.wisc.edu/read/messages?id=14246778

"Single sign-on is disabled for http URLs by default."

It does look like this can be disabled, but should only be done so in test or 
development environments; which I agree.

If all of this is correct I would highly recommend updating this wiki page 
then: 
https://wiki.jasig.org/display/CASC/Configuring+the+JA-SIG+CAS+Client+for+Java+using+JNDI

It shows a non-SSL URL for serverName while the other two are SSL URLs. This 
was the page that made me originally think it was possible.
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