Three new ads from a super PAC supporting Newt Gingrich tout the former House speaker and air some of the harshest attacks yet on former Massachusetts governor Mitt Romney.

Winning Our Future has bought air time in Georgia, Ohio, Oklahoma and Tennessee for next week, for a buy that totals about $1.75 million, along with buys in Alabama, Kansas and Mississippi.

The group has received another “substantial” contribution from billionaire casino mogul Sheldon Adelson, whose family has already given $10 million in support of Gingrich.

One ad strings together quotes from a variety of seemingly middle-class voters questioning Romney’s character.

“Mitt Romney,” the first voter in the ad says with a sigh and an eye-roll. “I really don’t know if I can trust him,” another says. “He doesn’t have the strength to stand up against Obama.”

“We’re looking at $5 or $6 dollar gas,” says a female voter. “Romney’s not the type to pump his own gas.”

A 60-second version of the same spot adds more praise for Gingrich.

“Not everyone in Washington likes Newt, but maybe that’s a good thing,” says a woman, with another chiming in: “He got things done.”

Another spot uses animation, showing a cartoon Romney sitting anxiously in a waiting room, holding his ticket to be the next GOP nominee.

“After five years of running for president, Mitt Romney has been queued up to be the establishment’s next guy in line,” says a pundit on a TV screen in the waiting room corner. “With a nation at risk, we need a true conservative leader who acts on principle.” Romney’s “28” ticket flies out the window.

Romney spokesman Ryan Williams dismissed the ads.

“When typical Washington politicians like Rick Santorum and Newt Gingrich get desperate, they resort to false and dishonest attack ads like these,” he said in a statement.