American Farm Bureau president highlights grassroots strength that makes Farm Bureau the premier agriculture advocacy organization in the country.

American Farm Bureau President Zippy Duvall said he looked across the fence at his two new draft horses, named Georgia and Peach, and scratched their heads. When they didn’t flinch, he thought the horses had potential.

Duvall moved into the pen and ran his hand across the horses’ backs, and they remained still. More potential. When...