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Billionaires lead in 2020 ad spending

2020 Democratic presidential candidates Tom Steyer and Michael Bloomberg, both multibillionaires, are leading all of their competitors in ad spending with a combined total of nearly $90 million. President Trump is in third place for his reelection bid. Axios media reporter Sara Fischer joins CBSN to break down the data and explain what it means for the race to the White House.
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