CREATE TABLE table_39844 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "Elected" FLOAT, "Status" TEXT, "2008 Candidates" TEXT, "Results" TEXT)

What District had Republican Incumbent Cathy McMorris?
SELECT "District" FROM table_39844 WHERE "Party" = 'republican' AND "Incumbent" = 'cathy mcmorris'
SELECT "District" FROM "table_39844" WHERE "Incumbent" = 'cathy mcmorris' AND "Party" = 'republican'