perhaps both parties talking about immigration & the border through the lens of crime reduction made it easier for some folks to think "oh s/he's not talking about me!"
http://socket.newrepublic.com/article/186336/kamala-harris-border-prosecutor
http://socket.newrepublic.com/article/186336/kamala-harris-border-prosecutor
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And maybe Stein but Stein didnt have to do much given yknow.
Not seeing this is why I think people are surprised by the Trump support
But I'm pretty sure you're right about the civil nature of immigration "crimes," and that would probably make pardons pointless.