Heidi Heitkamp in 2012, it was a Presidential election year so a lot of democrats figured she was going to lose especially since ND is quite conservative but she pulled out a victory despite Obama losing there by 20%.
Joseph Cao is the only answer.
Here in Canada, Bob Rae and many of the NDP candidates in Ontario in 1990, most Quebec NDP federal candidates in 2011 and some of the Alberta NDP candidates in 2015.
Ruth Ellen Brosseau in Quebec. Only got the spot because the guy who intended to contest in the riding bolted and she was a placeholder, she didnt even campaign there and didn't speak french at the time. And she won because of the orange wave in 2011.
Strangely enough even though the NDP was eaten up in Quebec last year by the Bloc, Conservatives and Liberals she kept her spot with even
a small swing to her.