Four inflection points transformed Mr. Biden from a pauper during the primaries to a powerhouse against President Trump.
Long before Joseph R. Biden Jr. was smashing online fund-raising records, long before it was clear he would become the Democratic nominee, his campaign was facing a serious cash crisis.
It was late summer 2019 and Mr. Biden’s online fund-raising had slowed to such a trickle that his team basically had to shut down its digital advertising program. They knew the choice was self-defeating: No more online ads meant no more finding new donors. The campaign bottomed out in early September 2019 when Mr. Biden raised just $24,124.17 online in a day.
Now? On one recent day, Mr. Biden was raising more than that every two minutes.
The unlikely transformation of Mr….