CREATE TABLE table_62028 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Results" TEXT)

What is the highest First Elected, when Party is 'Republican', and when District is 'Louisiana 7'?
SELECT MAX("First elected") FROM table_62028 WHERE "Party" = 'republican' AND "District" = 'louisiana 7'
SELECT MAX("First elected") FROM "table_62028" WHERE "District" = 'louisiana 7' AND "Party" = 'republican'