Not much of a choice(contribute.barackobama.com)
contribute.barackobama.com
Not much of a choice
https://contribute.barackobama.com/donation/election-night-with-barack/09/ofa.html?utm_medium=email&utm_source=obama&utm_content=httpsdonatebarackobamacomElectionNight&utm_campaign=em12_20121025_ofa_nd1&source=em12_20121025_ofa_nd1&amounts=5000|5000|5000|5000|5000|5000|5000|5000|5000
The extra information was present in the GET parameters being passed through the URL query string, if you look closely you will see this:
&amounts=|5000|5000|5000|5000|5000|5000|5000|5000
Removing this simply reverts it to it's normal state, however you can set the amount you want, some playing around revealed that it accepts only signed integers between 0 and 5000, anything over reverts to 5000, anything under reverts to 35 and is a string is used it reverts to the normal value.