Custom keybinding getting over-ridden in python mode

[Roy Smith]

I have two Ubuntu Precise boxes that are both running GNU Emacs 23.3.1.  I have 
the same init.el file on both boxes, which contains, among other things, the 
binding:

(global-set-key "\C-cm" 'compile)

On one machine (the one I've been running for a couple of years), this works in 
all modes.  On the new machine that I just set up, the keybinding seems to get 
lost in Python mode.  When I type C-C m, it echos "C-c m-" at the bottom of the 
screen and waits for more input. It works fine in other modes, and M-X compile 
works in python mode.

Any clue what might be different between the two boxes which is causing this 
behavior?

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Roy Smith
roy@panix.com