KINGSPORT — First it was the alderman candidates who paid a visit to the Kingsport Rotary Club. This past week, it was the mayoral candidates’ turn. Mike McIntire, Pat Shull and Nathan Vaughn — all of whom are running to be the city’s next mayor — attended a forum, where each was asked three questions under the broad categories of quality of life, economic development and infrastructure. Candidates Joe Carr and Dennis Mabb did not attend the event. Wednesday’s forum marked the second one hosted this campaign season by the Rotary Club.