One ad, to the humming and harmonies of the Simon and Garfunkel song “America,” shows Americans working, farming and excitedly flocking by the thousands to see Senator Bernie Sanders of Vermont on the campaign trail. Hope, it projects.

Another ad shows the White House, the rubble of ground zero, a fighter jet taking off from an aircraft carrier and snapshots from Hillary Clinton’s career: reading to children as the first lady and staring down President Vladimir V. Putin of Russia as the secretary of state. Experience, it projects.

Two 60-second commercials. Two very different stories. Two very different campaigns.

With just 11 days until the Iowa caucuses, Mrs. Clinton and Mr. Sanders have each begun to make closing arguments to Democratic voters.

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On Wednesday, Mrs. Clinton went first, with a commercial in which a narrator points to her record as the first lady, as a senator from New York and as President Obama’s secretary of state, and calls her “the one candidate for president who has everything it takes to do every part of the job.”