Well shoot kev413, I was hoping someone would come along that knows.
Those look awfully dark. Maybe the lighting? What have you been feeding them? Perhaps burned them from too much nitro?
Can't see the leaves too well. Maybe a couple pics of the leaves would help. Sorry that they are all doing the same. Do any of these look like what you may be seeing?

http://www.umassvegetable.org/soil_crop_pest_mgt/disease_mgt/tomato_tsmv.html

http://msucares.com/crops/comhort/tomatodisease/images/tswv.jpg

http://www.extension.umn.edu/yardandgarden/YGLNews/images2/Aug107/Salt_damage_tomato.jpg

http://hflp.sdstate.edu/IMAGES/Late%20blight%20on%20tomato%20leaflet.jpg

http://hflp.sdstate.edu/IMAGES/Late%20blight%20on%20tomato%20stem.jpg

Thanks for the reply cozy.I took a branch to a local garden center and had a couple of experts look at it,they confirmed my suspicion that it was to much water.Later that day I dug them up,the soil was wet to the touch and cool just a few inches down.I now think it was a combination of to much water and to much mulch early in the season,tomatoes don't like to stay wet or be in cool soil.

The picture I posted was pretty true as far as color,the stems were very dark.I don't think it's to much nitrogen,other plants in soil preped exactly the same way are doing well.The tip off for the garden center people was the fact that the leaves were browning from the tips and the fact that the stem when broken open was very wet,dripping wet actually,the inside of the stem also didn't have brown streaks ruling out most bacterial problems.