CREATE TABLE table_28004 ("Episode #" FLOAT, "The W\\u00f8rd" TEXT, "Guest" TEXT, "Introductory phrase" TEXT, "Original airdate" TEXT, "Production code" FLOAT)

What is the episode # when the guests were julie nixon eisenhower and david eisenhower?
SELECT MIN("Episode #") FROM table_28004 WHERE "Guest" = 'Julie Nixon Eisenhower and David Eisenhower'
SELECT MIN("Episode #") FROM "table_28004" WHERE "Guest" = 'Julie Nixon Eisenhower and David Eisenhower'