CREATE TABLE table_62423 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Results" TEXT)

Who is the republican Incumbent for Pennsylvania 9?
SELECT "Incumbent" FROM table_62423 WHERE "Party" = 'republican' AND "District" = 'pennsylvania 9'
SELECT "Incumbent" FROM "table_62423" WHERE "District" = 'pennsylvania 9' AND "Party" = 'republican'