Very nice work, but there are some bugs.
There was no button to press when Condoleeza Rice appeared and clicking on her text did not seem to have any effect, so I pressed the space bar to see what that would do and it sent me back to the level selection screen with Bush and Rice in front of it. Then I reentered the hall level and there were two Bushes: one behind a table and one behind a podium.
Also, much like how almost everyone who makes tank games gets the controls wrong, almost everyone who makes custom cursors gets it wrong and that is the case here. If the user right-clicks, the default mouse cursor reappears over yours. You should rehide it.
Finally, the controls took some getting used to; I would prefer if standing and ducking--or otherwise hiding behind an object--were more consistent. For example, always hide unless I press the spacebar to come out into the open, like in some arcade shooting games.
Aside from that, very nice work.