Could you provide me with a link? I'm sure you don't mean the Tscaesi.
I did. It all depends on whether you think the http://www.uesp.net/wiki/Lore:Tsaesci_(race) were vampiric snake-folk, as some lore describes them as. The literalness of that description can be debated elsewhere though. I'm just spit-ballin' here
EDIT: Whether vampires have infiltrated politics or not, I don't think there is anything definitive. But I have to wonder, why not? There isn't anything really preventing vampires from hiding their true selves.
"
Infiltrate" is a pretty loaded term to use as well, lol.