+ In 1998, Rep. Bob Dornan (R-CA) bitterly contested his election defeat to Democrat Loretta Sanchez (D-CA). But a three member panel set up by the House GOP ruled against Dornan, who had charged that he lost due to voter fraud and illegally cast ballots.
There have been other minor challenges, though most were denied because of a lack of evidence.
But in this race from North Carolina - there is no shortage of evidence which raises questions about the final tally, as Bladen County has seen odd results over the past ten years in terms of absentee ballots, which have benefited both Democrats and Republicans at times.
While Republicans are currently in charge of the U.S. House, any decision on the race between Republican Mark Harris and Democrat Dan McCready - which Harris won by 905 votes - would be made in the 116th Congress, when Democrats are in charge.
The new Congress convenes on January 3, 2019.