With the help of the Simon and Garfunkel song “America,” Senator Bernie Sanders of Vermont has released a powerful 60-second commercial in Iowa that seeks to remind his supporters how far he, and they, have come — and to inspire them anew to caucus for him on Feb. 1.

On Screen

A snowy farmhouse, whirling windmills in the gray distance. Bucolic small towns. Tugboats on a river. Parents with their children. Farmers with their cows. The Des Moines skyline. Young people at work. Hay bales being tossed.

No words are spoken, apart from the lyrics and Mr. Sanders’s “I approve” statement. But none are needed. As the music gains strength, the scenes change with each guitar strum: “Let us be lovers, we’ll marry our fortunes together,” the song goes, as a middle-aged man and woman dance at one Sanders rally, then two young women hold each other close at another.

Mr. Sanders is seen greeting voters on the campaign trail, first in small groups, then in gymnasiums, and finally at the huge rallies that became his hallmark. His wife is shown twice. At least 10 American flags can be spotted in different settings. And there are probably more Bernie Sanders smiles in evidence than many voters have ever seen.