My guess is Perdue has twice thought he won the Senate race, only to later fall short:
1) In Nov when it initially appeared he would get over 50% of the vote
Fell about 14,000 votes short of a surefire Senate majority on Nov. 3rd.
If Republicans won the 2016 New Hampshire senate race, they would have 51 seats today. That was only a 1017 vote margin to give the Democrats a trifecta that would come 4 years later.
Ah, yes, the good old times when Ayotte graciously conceded after the race was called instead of weeks of lawsuits, fraud allegations and recounts.