It has been widely remarked that covid-19 incidence has been heavily concentrated in urbanized blue areas. That has been true but it is becoming less so over time. This will undercut whatever advantages the Trump campaign believes it can derive from pitting red against blue areas on the disease and the appropriate policy response. As the charts below from Bill Frey's excellent analysis on the Brookings site demonstrate, new high covid-19 counties are increasingly from red and more rural areas.
This is another "fact on the ground' that Trump is unlikely to be able to escape.