WASHINGTON (Reuters) - Newt Gingrich won the Republican presidential primary in his home state of Georgia, TV networks projected on Tuesday, giving the former congressman his second victory of the primary season.

Gingrich, who spent much of the last week campaigning on his home turf, last won a victory in January in South Carolina. Georgia has the biggest number of delegates of the states holding nominating contests on Super Tuesday and Gingrich had said he had to win the state to keep his campaign viable.

(Reporting by Deborah Charles; Editing by Vicki Allen)