CREATE TABLE table_18516 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

For the Republican party what are the names of the incumbents?
SELECT "Incumbent" FROM table_18516 WHERE "Party" = 'Republican'
SELECT "Incumbent" FROM "table_18516" WHERE "Party" = 'Republican'