“Congressional Think Tank”? Would that term fall in the same category as any of the following:
a little big
accidentally on purpose
advanced beginner
arid ocean
boneless ribs
constant variable
cruel kindness
dangerously safe
deafening silence (& loud silence etc.)
definite maybe
deliberate mistake
deliberately thoughtless
digital film
To continue:
Jumbo shrimp
Military intelligence
honest politician
Last I heard it was called an oxymoron. There is an entire web site dedicated to them here:
http://www.oxymorons.info/
Yeah that says it all, astounded. (and a great tagline BUMP!)