CREATE TABLE table_18568 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What party is incumbent virgil chapman from?
SELECT "Party" FROM table_18568 WHERE "Incumbent" = 'Virgil Chapman'
SELECT "Party" FROM "table_18568" WHERE "Incumbent" = 'Virgil Chapman'