Bloomberg, fellow billionaire Tom Steyer and Sanders are the only candidates with more than $1 million in television advertising time already booked in the coming days in Super Tuesday states. Klobuchar has reserved about $874,000 so far in smaller states, skipping California and Texas, while Warren is advertising in smaller amounts in Colorado and Maine. Buttigieg has yet to reserve any TV ads beyond the South Carolina primary.

Meeting the $13 million goal would require Buttigieg to bring in more than $1 million per day until his self-imposed deadline.

“There are only a couple candidates out there with the funds to compete in all of those Super Tuesday states,” said Ami Copeland, deputy national finance director for Obama’s 2008 campaign. Other campaigns “have to fight among themselves for the smaller states.”

That made Warren’s strong debate performance Wednesday night especially important for her campaign, which said it raised over $5 million in less than 24 hours — a much-needed influx and her best fundraising day to date.