Haven't you heard the news? The Dems (Unions included) are united in their support of Amnesty for Illegals. Unions support the suppression of member wages caused by undocumented, unskilled (and non-union) laborers.
Its the Republicans that are split over the issue of Amnesty for Illegals.
And then there's McCain wanting free amnesty for all (I'm really starting to hate that man. No presidency for him - ever!).
You're right, of course. Union leadership has a vested interest in seeing their members under siege and worried. You'd think they would at least make a show of trying to act on their behalf though?