The Hitchhiker’s Guide to why there may be a partial government shutdown Saturday

Funding for the Department of Homeland Security was already a question for some Democrats before the killing of Alex Pretti.

But Saturday’s killing by ICE agents gave Democrats who were on the fence about supporting the upcoming government funding plan a reason to solidify their opposition. And the killing only hardened those who were opposed to funding DHS before.

From a political standpoint, Democrats are compelled to fight this. Otherwise, their base will balk. Senate Minority Leader Chuck Schumer...