Mitt Romney's presidential campaign is stumped by the candidate's rapid Twitter follower growth, with the candidate's account gaining more than 75,000 followers in less than a day.

The website 140elect.com, which tracks the Twitter presence of presidential candidates, first noticed the spike.

Zac Moffatt, the Romney campaign's digital director, rejected accusations that the campaign was "buying" followers for Romney, who trails Barack Obama's account by more than 16 million followers.

"We have reached out to Twitter to find out additional information regarding the rapid growth," he told BuzzFeed.