Summer 1847
Mr. Smith, a Democrat, was elected to the first convention to frame a State constitution.
Nation and worldGrade A · 1 independent source
The evidence
“In the summer of 1847, Mr. Smith, although a Democrat, was elected to the first convention to frame a State constitution, to represent a constituency, which, up to that time, had been largely Whig, and succeeded in preparing a report which was unanimously recommended by the committee and adopted by the convention.”
1879-history-of-rock-county/17-bios-janesville.md, PDF p. 719 / book p. 723
Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.
Grade A: Found on a page of one of our sources