CREATE TABLE table_18712 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What is the least first elected for jeff busby?
SELECT MIN("First elected") FROM table_18712 WHERE "Incumbent" = 'Jeff Busby'
SELECT MIN("First elected") FROM "table_18712" WHERE "Incumbent" = 'Jeff Busby'