Republican strategist Mattie Duppler said on Wednesday that those who registered to vote after musician Taylor Swift announced her endorsement of former Tennessee Gov. Phil Bredesen (D) for Senate may not end up getting to the polls in November.

"I think it's another interesting question of whether or not people who are energized when Taylor Swift posts on Instagram are the same people who show up and vote," Duppler, founder and vice president of Forward Strategies, told Hill.TV's Buck Sexton and Krystal Ball on "Rising."

"This has been the problem for Democrats a lot, very pervasively, which is that young people identify as Democrats, but they do not show up and vote in midterms," she continued.

Vote.org revealed earlier this week that it witnessed a flood of new voter registrations since Swift broke her silence on politics.

“We are up to 65,000 registrations in a single 24-hour period since T. Swift's post,” Kamari Guthrie, director of communications for Vote.org, told BuzzFeed News in a report published on Monday night.

“Vote.org saw [Tennessee] registrations spike specifically since Taylor's post," Guthrie continued.

Swift reiterated her call for people to register to vote at the American Music Awards on Tuesday.

"This award and every single award given out tonight were voted on by the people, and you know what else is voted on by the people?" Swift asked as she accepted the "artist of the year" award. "It is the midterm elections on Nov. 6. Get out and vote. I love you guys."

— Julia Manchester