The PAC's coordinator, longtime Gingrich aide Rick Tyler, said the group was airing ads in Alabama, Mississippi and Kansas, and would continue them through next week. Tyler declined to say whether donations had increased in light of Tuesday's voting.
Bob Walker, a Washington lobbyist and top Gingrich adviser, said Gingrich can compete outside of the South and intends to contest primaries in Illinois on March 20, and Pennsylvania and New York on April 24.
"There remains an open question as to who is the stronger competitor — not only to Mitt Romney, but who is the person who can beat Obama? " Walker said. "There's a real question of Mitt and Rick's ability to go up against the president."
Associated Press writers Beth Fouhy in Washington and Steve Peoples in Kansas contributed to this report.