Henry Dodge was elected delegate to Congress, filling the vacancy caused by Doty's appointment; one passage gives the date as September 30, 1841.

The evidence

• “Dodge was removed from office by John Tyler, then president of the United States, and James Duane Doty appointed in his place. The appointment of Doty, then the delegate of the Territory in congress, by the president of the United States as governor, and the consequent resignation of the latter of his seat in the house of representatives, caused a vacancy which was filled by the election of Henry Dodge to that office, on the 27th of September, 1841; so that Doty and Dodge changed places. Dodge took his seat for the first time, at the commencement of the second session of the twenty^ fifth congress — Monday, December 7, 1841.”

  1879-history-of-rock-county/01-wisconsin-antiquities-indians-territory.md, PDF p. 45 / book p. 49

  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