Clinton was nominated for his book "Giving: How Each of Us Can Change the World" and Carter for "Sunday Mornings in Plains: Bringing Peace to a Changing World." Also nominated was Maya Angelou and Alan Alda.
Obama also won the spoken-word category in 2006 for his memoir "Dreams of My Father."
Sens. Obama and Hillary Rodham Clinton are battling for the Democratic nomination for president; both have won key states, though Obama has the most recent wins, capturing the Louisiana primary and caucuses in Nebraska and Washington state on Saturday.
Though Clinton and Carter lost, they both have won the category before (Clinton, twice). And Hillary Rodham Clinton took home a Grammy in 1996 for her audio version of the book, "It Takes A Village."
