A look at the figures shows why the antagonism exists. The WNBA players and fans are just on a different political planet than Loeffler. Moreover, Loeffler almost certainly sees political advantage for the fight.
If you examine the fan base of the WNBA, you can see that the WNBA does not really have to lose annoying fans who take causes from links.
A look at interviews and studies shows that WNBA fans are much more likely than the general population to be in groups that pay Democratically. WNBA fans are more likely to be women, are college graduates, and are Black adults. In fact, the limited data we have suggests that more WNBA fans are democratically paid than one of the major male professional sports classes (e.g., MLB, NBA, NFL, and NHL).
Loeffler, meanwhile, is a conservative Republican. More than that, she has an election this year. Loeffler is involved in a highly competitive jungle primary in which all candidates from all parties will face each other. The top two candidates will advance to a runoff, unless one candidate gets more than 50% of the votes in round one.
Chances are high that Collins or Loeffler will advance to the runoff, and not both. Whoever appeals to the most Republicans will advance to that runoff.
Loeffler is a fish out of water when it comes to the normally liberal ways of the WNBA. She can benefit from being opposed to them.
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