TULARE, Calif. (AP) — Newt Gingrich's presidential campaign has a history of near-death experiences, and the former House speaker insists another resurrection is on its way.

The third time may not be the charm.

Gingrich sustained a string of disappointing performances in several state contests last week and has watched rival Rick Santorum emerge as the leading conservative opponent to Mitt Romney.

While Romney and Santorum are preparing to face off in Michigan's primary Feb. 28 and Romney is campaigning to win Arizona the same day, Gingrich has all but stepped off the campaign trail to focus on raising money in California.

Ahead lie the 10-state Super Tuesday contests of March 6 and a handful of Southern states where Gingrich hopes he can revive his sputtering candidacy.