Vice President Kamala Harris has reportedly raised as much as $1 billion since taking over the Democratic ticket, with much of that sum fueling major ad buys. Yet the dead-even state of the race and online rebuke of her myriad messaging efforts suggests she may not be receiving her money’s worth. President Joe Biden dropped his reelection bid in late July. Between that date and the end of August, the Harris campaign made a total of 33 disbursements under the description “media buy...