The data doesn't really tell us the answer to the question: what limit do Democrats want on legal immigration? There's still a lot of ambiguity.
We can discuss more than one political issue at a time. We don't have to view every small issue as a proxy for different fights. An opinion about the solutions for the migrant crisis isn't necessarily an indication of where you stand on tax cuts for the rich or the overall state of politics.
For Trump supporters who don't see the racism as a good thing, they would think either that the criticisms against him are exaggerated, or that the upsides to his presidency exceed the downsides to liberals and/ or establishment Republicans who wanted have the courage to do stuff like allowing an American embassy to Jerusalem.
If you're really concerned about people wanting to know that there are trustworthy sources, you could cite the multiple sources. In this case, it seems to be one source, a facebook post by a local organization MIRAC - Minnesota Immigrant Rights Action Committee.
MIRAC - Minnesota Immigrant Rights Action Committee
I'm pretty sure the people who want to Abolish ICE don't just want to rein it in a little.
It's a rather safe Democratic district. I'm glad she's getting coverage, but she'd be lucky to get 25 percent (which would be higher than results for McCain, Romney or Trump is in the district.)