Lee, I don't know if this is what your after but using google and entering Walter T. Colquitt speech nashville tennessee 1850 I found this site.

Full text of "Condensed proceedings of the Southern convention"FALL www.archive.org/stream/.../condensedproceed00sout_djvu.txt - Cached - Similar

I would assume that Colquitt County Georgia might be named for him? If so the local historical society or library might have a copy of the paper?