Democratic White House hopeful Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE in his last ad before the Iowa caucuses is emphasizing his electability and asking voters to imagine what could happen if he is elected in November.

“Imagine all the progress we can make in the next four years. Imagine a country where affordable health care is a right, not a privilege," the former vice president says in the ad, which was first reported by Politico.

“What we imagine today, you can make a reality," he adds. "But first we need to beat Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE. Then there will be no limit to what we can do."

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Biden in the ad also lists priorities such as health care legislation and an assault weapons ban.

The 30-second spot will reportedly run on Iowa TV stations and on the streaming service Hulu through next Monday, when Iowa voters will turn out for the first contest of the 2020 primary.

Biden trails a surging Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) by 3 percentage points in Iowa, according to a RealClearPolitics average of recent polling. Sanders has 25 percent support just days before the caucuses, compared to Biden's 22 percent.

The former vice president has sought to emphasize his moderate views and electability as he faces off against Sanders, a hero of the progressive wing of the Democratic Party.