CREATE TABLE table_3473 ("District" FLOAT, "Senator" TEXT, "Party" TEXT, "Residence" TEXT, "First elected" TEXT, "Term Limited" FLOAT)

What is the term limit for Senator Tom Niehaus?
SELECT MIN("Term Limited") FROM table_3473 WHERE "Senator" = 'Tom Niehaus'
SELECT MIN("Term Limited") FROM "table_3473" WHERE "Senator" = 'Tom Niehaus'