If you are using Audition 1.5, and if the camera mic was a stereo mic, and if it was pointing towards the person speaking – then, you could try the Centre Channel Extractor effect to increase the level of the voice in the centre compared with everything else.
Alternatively, try the parametric equaliser, and create a “hump” in its graphic display, which then slowly drag from side to side to try to hear whether, by boosting the level of different frequencies, you help to increase the clarity of the voice. Process the file with the clearest setting this experiment reveals. (Shorthand description – hope it points you in the right direction).