Btw: along with Maine, I'd suggest Dems look to Iowa for clues on why 287(g) hasn't taken off in some states, esp. relative to their neighbors. Iowa only has 2 active agreements: the state Dept. of Public Safety + Marion County sheriff (pop 34K, just outside Des Moines).

ICE 287(g) Program Tracker | Titus ConsultingInteractive map and data visualization tool tracking local law enforcement partnerships with ICE under the 287(g) program. Understand how immigration enforcement operates in your community.www.tituslegaldesign.comAndrew Thrasher

While I can't speak to Maine politics, I think the local resistance to proxy immigration policy, like 287(g), is notable too. Even before the new state-level ban started this week, local participation was both uncommon and unpopular, with just 1 recent agreement that was canceled last fall.