Sanders evokes JFK, FDR and Johnson in new Iowa ad

Sen. Bernie SandersBernie SandersBloomberg campaign: Primary is two-way race with Sanders Warren: Bloomberg making debate will show how other candidates handle 'an egomaniac billionaire' HuffPost reporter: Sanders could win plurality of delegates but lose nomination MORE (I-Vt.) evoked the legacies of Democratic presidents known for their advocacy for a robust social safety net and sweeping social change in his presidential campaign’s final Iowa ad ahead of Tuesday’s Democratic debate, the last one before the Iowa caucuses.

The 30-second spot, titled "Strive," opens with a clip of President John F. Kennedy’s famous speech in which he called for the U.S. to send a man to the moon, saying, “We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard.”

“President Kennedy knew settling for half-measures wasn't good enough,” Sanders says in voice-over over images from his own campaign as well as images from the Franklin Roosevelt and Lyndon Johnson administrations, the civil rights and women’s liberation movements, and protests for climate action.

“So when candidates say we can’t guarantee health care for all, make college affordable for all, combat climate change, or create a world at peace, remember that America is best when we strive to do big things, even when it’s hard,” Sanders adds.

Sanders’s more centrist competitors in the race, such as former Vice President Joe BidenJoe BidenBloomberg campaign: Primary is two-way race with Sanders HuffPost reporter: Sanders could win plurality of delegates but lose nomination Meghan McCain to Joy Behar: 'You guys have done a piss-poor job of convincing me that I should vote for a Democrat' MORE and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegHuffPost reporter: Sanders could win plurality of delegates but lose nomination Sanders campaign expands operations in Michigan Sanders leads among Latino voters: poll MORE, have frequently assailed some of his signature proposals, such as "Medicare for All" and forgiveness of student loan debt, as unrealistic.