WASHINGTON— Former Massachusetts Gov. Mitt Romney has won the Republican presidential caucuses in Hawaii, salvaging a much-needed victory after resurgent rival Rick Santorum won primaries in Alabama and Mississippi on Tuesday. Romney finished a disappointing third behind Santorum and former House Speaker Newt Gingrich in the Deep South primaries. But he came back to edge out both rivals in Hawaii and added a sweep of delegates from Republican nominating caucuses in American Samoa. Texas Rep. Ron Paul finished fourth in both Southern primaries, and third in the Hawaii caucuses. Romney got nine delegates in American Samoa. About 70 Republicans in...