Am I right in thinking that you can only run one Agenda at a time (aside from 'The North')

I seem to recall this being the case, but I can't find the reference, and would quite like to run two, so I thought I'd ask on the off chance.

Quoting from the rule book:

"Before you start the game, you may choose a single agenda and place it beside your House card to gain its benefits (and drawbacks) for the entire game." (emphasis added)