When I read the news about Roseanne Barr insulting Valerie Jarrett, I checked Jarrett's Wikipedia page to see who Jarrett was. As far as I can tell, she was a member of the Obama administration at the level only politics nerds hear about (can you name the previous Director of the Office of Public Liaison, or the current one?). But not only is Roseannne tweeting about her, but Skeptics.SE has a popular question about a forged image libeling her.
Why has Jarrett come to sudden prominence?