Castro said he'll drop out if he doesn't raise $800k by the end of the month.
Where's the libel/slander in what Clinton said? She said "asset" right, not "agent"? I'm not saying that you need to agree, but I think reasonable people can believe that Stein was an asset to Trump and all of those who stood to gain from his win, and Gabbard seems to be going out of her way to make as many enemies in the Democratic party as she can, and should she choose to run an independent campaign and/or take shots at the eventual Democratic nominee, you could make a similar case. Or you can disagree, but we all disagree about the worth of many things. Now if she had called them agents (and technically I think Clinton said that Gabbard is being groomed by Republicans, not Russians, certainly anyone can see that conservative media is providing some support)
I'd be curious what would happen if someone like Gore, Kerry, or maybe a ten-year-younger Carter threw their hat(s) into the ring, that'd make for some fun speculation.