Don't know that this will be of any help but I found a series of WMS files - see the link below -
The files cover the Census and ACS data - don't know if they contain the type of information you need -
That said they are WMS files that you can load into Tableau as Map services and use as background layers to your map (just like the tableau map files that are there)
Each file contains multiple layers -
Let me know if this helped
Thank you for the follow up. The data that I am trying to map are the boundaries of the various Continuums of Care across the nation. The data is available via HUD: Continuum of Care GIS Tools - HUD Exchange
I do not believe HUD supplies WMS files.
Thank you again!
well it was worth a try