CREATE TABLE table_18527 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

Which party had Clair Engle as an incumbent?
SELECT "Party" FROM table_18527 WHERE "Incumbent" = 'Clair Engle'
SELECT "Party" FROM "table_18527" WHERE "Incumbent" = 'Clair Engle'