According to some here the ONLY reason Tulsi gets as much as hate as she does is she endorsed Sanders and only gets it from die-hard Clinton hacks, (including some who are as such despite voting for Sanders.)
So why doesn't Sanders himself get anywhere near this much? I mean if endorsing Bernie Sanders is so terrible, you'd think being him would be the worst thing ever.
It isn't about supporting Sanders. It's because Gabbard was hesitant to support Clinton. It's also because of her comments about Bashar al-Assad.