I contacted the fifteen you listed myself, plus a few more that NumbersUSA identified may need some bolstering. Below are the Senators that NumbersUSA identified:
Burr (R-NC)
Chambliss (R-GA)
Ensign (R-NV)
Isakson (R-GA)
Thune (R-SD)
You might want to drop a line to these folks as well.
Read this and weep..maybe someone can post this I couldnt find it anywhere
Immigration bill hides one trilion dollar time bomb..
http://www.newsmax.com/archives/articles/2007/6/17/200944.shtml?s=al&promo_code=35A4-1