CREATE TABLE table_72950 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Results" TEXT, "Candidates" TEXT)

Who were the candidates when the first elected was a republican in 1998?
SELECT "Candidates" FROM table_72950 WHERE "First elected" = '1998' AND "Party" = 'Republican'
SELECT "Candidates" FROM "table_72950" WHERE "First elected" = '1998' AND "Party" = 'Republican'