1994 Sunbird with a wet floorboard

I've got a 1994 Sunbird I drive to work and it has been raining here a bunch. I have a wet flloorboard on the drivers side down by where the heel of your foot rests while your driving it its wet in back in the same area. I can't see any visible leaks. Is there anywhere under the car I could check where water could splash in while driving down the road??

This is from the Grand Am forum, but I have seen two cavaliers with the same problem too.

http://www.automotiveforums.com/vbulletin/showthread.php?t=329750&highlight=mystery+water

Hope it helps.