NEW YORK (AP) — Sen. Joni Ernst has a memoir coming out in May. The book is called “Daughter of the Heartland: My Ode to the Country That Raised Me.” According to her publisher, Threshold Editions, Ernst will tell of a journey from farm girl to first female senator from Iowa. Her book arrives as she faces what is expected to be a competitive race for re-election. Ernst is among a handful of Republican incumbents whom Democrats and pollsters have identified as vulnerable in 2020. The 49-year-old Ernst was elected to the Senate in 2014.