The Democrat challenging Senate Majority Leader Mitch McConnell (R-Ky.) for his coveted seat had an impressive few hours in the first day of her campaign.

Amy McGrath’s campaign raised $2.5 million in the 24 hours following its launch, campaign manager Mark Nickolas told The Post, adding that they raised $1 million in the first 5½ hours alone.

Nickolas said the average contribution was $36 — for the most ever raised in the first 24 hours of a Senate campaign.

Prior to McGrath’s milestone, the record was held by current Arizona Senate candidate Mark Kelly, who raised $1 million in the first 24 hours of his campaign for the seat formerly held by John McCain, according to the Democratic Senatorial Campaign Committee.

During the 2018 midterms, McGrath lost an extremely tight race to unseat Kentucky Rep. Andy Barr by fewer than 10,000 votes.

The 44-year-old former Marine fighter pilot was a political newcomer facing an incumbent in a state President Trump carried in 2016 by nearly 30 points.

In her Senate campaign launch, McGrath blamed McConnell for the current divisiveness in the country caused by politics, saying, “I’m running for Senate because it shouldn’t be like this.”

McGrath remarked how the nation’s current politics had torn Americans apart with “anger and blame,” adding that “everything that’s wrong in Washington had to start someplace.

“Well​,​ it started with this man, who was elected a ​lifetime ago and who has, bit by bit​,​ year by year​, turned Washington into something we all despise.”

In response to her campaign launch video, McConnell’s re-election campaign chairman Kevin Golden said in a statement, “Amy McGrath lost her only race in a Democratic wave election because she is an extreme liberal who is far out of touch with Kentuckians.”