One interesting thing is that one of his best cities appears to have been Tampa which surprises me as to my knowledge Tampa does not have a particularly high Jewish population. Yet he crossed 9% in Hillsborough County.
The Internet (and Google) is amazing. I googled: "Why did Henry Wallace do so well in Tampa in 1948?" and came up with this:
https://scholarcommons.usf.edu/cgi/viewcontent.cgi?article=1373&context=sunlandtribune
The Latin community was quite prominent in the Tampa areas of Ybor City and West Tampa in 1948. Wallace won seven precincts in those areas that year. A tiny bastion of radicalism in an otherwise conservative region.
Very interesting! I had no idea there was such a large Latino community in Tampa at the time. It was a really outstanding bastion of radicalism indeed.
It wasn't just at the time, the Hispanic/Latino community is still quite prominent in Tampa (being 1/4th of the population), &
especially so in Ybor City (comprising more than 2/5ths of the population) & West Tampa (more than 1/2 of the population).