Often, when a candidate cancels an ad buy, it’s either a sign of shifting priorities (a desire to go all in on a certain state) or a sign of flailing finances.

For Biden, signs point to a little of both.

After a disappointing finish in Iowa and fund-raising that lags behind his top rivals, Biden’s campaign appears to be shifting its focus to Nevada. It pulled nearly $150,000 in advertising from South Carolina and $60,000 from Nevada. But the campaign then quickly added $160,000 to Nevada, a move known as “shuffling” that occasionally drives a mistaken report on social media that a candidate is cutting ads when he or she is really just shifting money around.

Biden has been getting air cover from Unite the Country, a super PAC supporting his candidacy. It has currently reserved more than $720,000 on New Hampshire television in an effort to bring Mr. Biden’s sagging television advertising into parity with some of the top-tier candidates (those who are not self-funding billionaires, that is).

Buttigieg, who detoured to New York on Wednesday for a fund-raiser, has also been getting some help on the air from a super PAC — Vote Vets, which is poised to spend nearly $1.3 million for Buttigieg in New Hampshire, according to Advertising Analytics.

Warren, on the other hand, was forced to take down roughly $375,000 worth of ads in South Carolina and Nevada, and has no current plans to put that money back into television advertising.

“I just always want to be careful about how we spend our money,” Warren told The Washington Post on Wednesday.

Sanders, by contrast, announced on Thursday that after raising a whopping $25 million in January, he had placed TV and digital ad buys totaling $5.5 million in 10 different states through Super Tuesday.