CREATE TABLE table_18106 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Results" TEXT, "Candidates" TEXT)

What year was Luis Gutierrez election
SELECT MIN("First elected") FROM table_18106 WHERE "Incumbent" = 'Luis Gutierrez'
SELECT MIN("First elected") FROM "table_18106" WHERE "Incumbent" = 'Luis Gutierrez'