It's spam. My IP is 68.xxx.xxx.xxx and I'm in Houston.
The problem is that the spammer can "change" his/her IP address by changing his/her network card or going offline by unplugging his cable modem for awhile then plug it back in with the hope that his IP address will change.....assuming that he has a dynamic IP.
If he has a static IP then you can nail him. :-)
Thanks for the help and I hope we can track this crap down and stop it.