WASHINGTON (AFP) - White House hopeful Mitt Romney has meticulously spelled out his vision for a better America while on the campaign trail this year. But in his new mobile app? Not so much.

The "With Mitt" application for the iPhone allows users to express support for the recently anointed Republican flagbearer by personalizing a photo with an overlaid Romney slogan. Trouble is, one of the slogans had a howler of a spelling mistake: "A Better Amercia."

Members of the proofreading public recently made the discovery and it went viral on Twitter late Tuesday, with people mockingly tweeting photos showing the "Amercia" message.

"Some poor app designer is getting strapped in a cage on the top of a car and driven across country tonight. #amercia," one user tweeted, in a reference to Romney's hard-to-live-down decision years ago to strap the family dog in its carrier on the roof of the car during a vacation.

Early on Wednesday, the app, promoted by official campaign website mittromney.com, had yet to be corrected, and new downloads contained the spelling error.

"Mistakes happen," Romney campaign spokeswoman Andrea Saul said on MSNBC.

"I don't think any voter cares about a typo at the end of the day," she said, adding that an update had been sent to Apple.

Hours later, the company's app store was offering an updated version with the embarrassing mistake corrected.