America's favourite undecided voter Ken Bone has been enjoying his 15 minutes of fame after his flashy red sweater, earnest, charming manner and straightforward question won the internet's heart during the second presidential election. Now, the overnight internet sensation has been accused of selling out after using his newfound fame to advertise for popular ride-sharing service Uber.

"Everyone wants to know if I've decided... and I have," Bone wrote on his Twitter account on Thursday (13 October) which now boasts over 235,000 followers. "UberSelect helps you ride in style like me."

UberSelect is the company's new luxury car-share service launched in St. Louis, Missouri - the city that hosted the second presidential debate - that touts high-end vehicles including Audi, Mercedes, BMW and Lexus.

"All of this was more than enough to win over the formerly undecided Ken Bone, who this morning took the first-ever UberSelect ride in St. Louis!" Uber Midwest marketing manager Zack Slezak wrote in a blog post.

The St. Louis Post-Dispatch reports that Bone took "a brief ride in a Tesla" on Thursday - his first ever Uber ride - before returning to tell reporters that the new service matched his "high sense of impeccable style."

When asked whether Uber paid for his endorsement of the service, he said, "I'm not a millionaire and they're not hurling money at me."

Molly Spaeth, a spokeswoman for Uber, told CNN Money that the 34-year-old Illinois coal plant operator was being provided with free rides rather than cash. However, the company declined to specify the amount.

"We are providing him with Uber credit for his role in the launch," she said.

Many social media users, however, soon voiced their opinions on his endorsement.

Bone also plans to sell his own branded T-Shirt as well which he announced in a tweet saying, "America, prepare to enter the #bonezone."

Earlier this week, Bone was propelled to internet fame after asking the presidential candidates about their energy policies. Since then Bone has inspired countless memes, jokes, Facebook pages, a Halloween costume and hundreds of thousands of fans. He also appeared on multiple political and late-night talk shows.

"It's gonna be back to work tomorrow night on night shift," he told The Washington Post earlier this week. "But I'll be taking the time to hopefully tweet out to all my new followers and try to reiterate to them their voice matters."