For all the candidates, the next five weeks will be crucial. More than 70 percent of GOP delegates will be selected in primaries and caucuses during that time. Right now Buchanan leads the pack with 28 delegates, while Dole has 16 and Alexander nine. At least 996 out of 1,990 delegates are needed to win the nomination. The immediate test will come next Tuesday in primaries in Arizona and the Dakotas.