Here's a look at ad spending through today (including future reservations:

Bloomberg: $417.7 million
Steyer: $193.6 million
Sanders: $41.8 million
Buttigieg: $40 millon
Warren: $21.4 million
Biden: $12.3 million
Klobuchar: $10.6 million
Gabbard $5.4 million

— David Wright (@DavidWright_7) February 16, 2020