The former U.S. House speaker's comments came in an interview on CNN when he was asked about House Majority Leader Eric Cantor, R-Va., backing Romney.
"The fact is [former Massachusetts Gov.] Romney is the Washington establishment candidate," Gingrich said. "It's true, if you look at where does his money come from, where are most of the lobbyists lined up. So I think he goes around the country and he's legitimately collected most of the insiders."
Cantor, Gingrich said, "is sort of quintessentially a part of that same group."
Speaking of his own bid for the GOP nomination, Gingrich said: "I think that I have run a populist campaign. We have about 173,000 donors, 95 percent of them less than $250.
"I have run a campaign that is focused on things like getting gasoline prices down to $2.50 or less a gallon, creating an American energy plan so that no future president would ever bow to a Saudi king, and I think that I represent very, very dramatic change for Washington."
Candidates will be competing in Georgia and nine other states with 419 total delegates at stake on Super Tuesday.