Because they have no respect for the presumptive nominee. I've been to those sites. The names that Barack and Michelle are called is beyond the pale. THe Obamas do not deserve and have not earned the vitrol spewed at sites such as No nickles, Confluence, Bitter politicz, etc., etc.
IMO most of the posters are Repubs egging on the worst in people. They are sinking dollars into this tactic. But it will fail, because Repub is a broken brand.
A 20 mil payoff for the hostages in Columbia. Who paid it?
Obviously you've never visited any of those sites to make such a wild, baseless accusation.
And if you're pissed off about "vitrol spewed" against progressive Democrats, where were you on this site when the same was spewed at Hillary?
<crickets>
I've visited these sites and found lots of vile comments aimed at Obama, Michelle, Donna Brazille, and others. I will not promote their filth by posting it here. If anyone has any doubts just spend 10 minutes on any of those sites.