In North Carolina and Texas, the campaign will run radio ads saying Biden will build on the work of the Obama-Biden administration, and the campaign is running digital ads in California, North Carolina and Texas. An announcement from the campaign said the advertising is to “encourage early voting” in those eight states; an aide declined to share an exact figure attached to the buy.

“Joe Biden has built the broad and diverse coalition that we know it will take to beat Donald Trump, and these resources will allow us to continue to bring the Vice President’s message to the voters that we know make up the base of our party,” Molly Ritner, Biden’s director of Super Tuesday states, said in a statement.

According to data compiled by Advertising Analytics, an ad tracking firm, Biden is spending by far the least on Super Tuesday TV ads out of all the candidates who participated in Tuesday night’s debate in South Carolina.

Bernie Sanders, the current frontrunner for the Democratic nomination who has blown by Biden in both national polling and the hunt for national convention delegates, has aired or reserved roughly $13.5 million worth of airtime across all 14 of the Super Tuesday states. He’s dropped at least seven figures in three states — Texas, North Carolina and Colorado — and mid-six figures in three additional states.

Amy Klobuchar’s campaign has booked about $3.5 million worth of television time, and her campaign says it has invested more in digital spending. Pete Buttigieg, another campaign that went up late in Super Tuesday states, hits about $1.6 million in TV spending, and Elizabeth Warren comes in at a bit over $916,000.

All of them are dwarfed by the two self-financing billionaires in the race. According to Advertising Analytics, Mike Bloomberg has spent over $183 million on blanketing the airwaves in Super Tuesday states — en route to spending over half a billion dollars in total on advertising for his campaign so far — while Tom Steyer has spent over $35 million, more than double what Sanders dropped.

Also missing from Biden’s Super Tuesday ad mix is any outside support.

Super PACs — which legally cannot coordinate with campaigns — supporting several of his opponents have announced significant advertising campaigns in Super Tuesday states, but Unite the Country, the group backing Biden, has not gotten involved. According to Advertising Analytics, Unite the Country has not made a television buy in any Super Tuesday state.

Persist PAC, which backs Warren, said it will spend $3 million on television and digital ads in eight Super Tuesday states, while the pro-Buttigieg VoteVets promised “seven figures” worth of television ads backing the former South Bend, Ind., mayor. Kitchen Table Conversations PAC, a new super PAC that supports Klobuchar, has spent $408,000 on television in three Super Tuesday states so far.

The Biden campaign believes he's in it for the long haul, however. His campaign is riding high in South Carolina, where he was endorsed by local kingmaker Rep. Jim Clyburn on Wednesday. The campaign hopes to use a strong performance in South Carolina to spring him into contention in Super Tuesday states and beyond. The Biden campaign announced state leadership groups in six states — Illinois, Ohio, Michigan, Arizona, Missouri and Washington — all of which vote after Super Tuesday.