Connor was a former law partner and political ally of Iowa Governor
Leslie M. Shaw. but Shaw instead chose Connor's congressman,
Jonathan P. Dolliver, thus creating a new vacancy in the U.S. House. Dolliver's House seat (in Iowa's 10th congressional district) was filled by a direct election between candidates chosen by district conventions. On the 96th ballot, Conner received the Republican nomination over a crowded field, and was elected in the general election. After serving in the
Fifty-sixth Congress, he was reelected two years later (in 1902) to the
Fifty-seventh, and later to the three succeeding Congresses. In 1908, Connor was defeated in the Republican primary by newspaper publisher
Frank P. Woods, as part of a broader attempt by the party's progressive wing to displace incumbents from the more conservative "standpatter" wing. In all, Connor served in Congress from December 4, 1900, to March 3, 1909. ==After Congress==