Former Vice President Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE’s presidential campaign is launching its biggest ad buy of the 2020 cycle, unleashing a $12 million blitz in key states that will hold their primaries on March 10 and 17.

The two ads, first reported by The Associated Press and confirmed by several Biden officials, will be featured on digital platforms and television markets across Michigan, Missouri and Mississippi, which hold primaries on March 10, and Florida, Illinois and Ohio, where voters head to the polls on March 17. The former vice president will appear in all six states in person before March 17 to gin up support.

“Always,” one of the two new ads, rebukes Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE’s (I-Vt.) criticism of Biden’s record on Social Security, saying the former vice president has always defended the program and that negative attacks will only bolster President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE come November.

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“PolitiFact has called the Sanders campaign’s attacks ‘False.’ Joe Biden has always been a strong supporter of Social Security. Biden will increase Social Security benefits and protect it for generations to come,” says a male narrator. “Negative ads will only help Donald Trump. It’s time we bring our party together.”

The first ad comes in response to ramped up attacks from Sanders following Biden’s nearly 30-point landslide in the South Carolina primary and surprise victories in 10 of 14 Super Tuesday states. Sanders has focused much of his fire on Biden’s past support of the North American Free Trade Agreement (NAFTA) and record Social Security, two issues he hopes will help dent Biden’s support among white blue-collar voters.

Biden has warned that the primary battle, which has narrowed to just him and Sanders, could turn negative, urging the Vermont lawmaker to avoid a “bloodbath.”

“What we can't let happen is let this primary become a negative bloodbath,” Biden said at a Maryland fundraiser Friday. “But Bernie is going to throw — he'll at least throw the dishwasher at me.”

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“Service,” the second of the two new spots, underscores Biden’s time as President Obama’s vice president and features Obama calling him the “finest vice president we have ever seen” during his awarding of the Presidential Medal of Freedom.

Obama remains widely popular across the Democratic Party — a point proved when Sanders also released ads featuring him and the former president.

The new ad blitz comes in a critical stretch of the primary contest, with Biden hoping to expand what is expected to be a narrow delegate lead after all the Super Tuesday ballots are tallied and Sanders eager to make up ground after the former vice president’s unexpectedly strong showing.

Michigan, Mississippi and Missouri, the three March 10 states targeted by Biden, will allocate a combined 229 pledged delegates, while Florida, Illinois and Ohio will together apportion a whopping 510 delegates.