Yes, and Rush named names yesterday, the Koch Brothers (funders and founders of Americans for Tax Reform, which I joined) and Ken Adelson (deep pocket funder of Newt Gingrich, another Amnesty-loving GOP-er!)
I think you're confusing ATR with Americans for Prosperity.
But you're right, the Koch brothers are Beltway libertarians (cosmotarians), and probably agree with Reason Mag, Cato, the WSJ, among others, on the subject of open borders and immigration.
Adelson is the worst though.
Not only a huge proponent of open borders-and an hypocrite-but he tried to foist Newt Gingrich upon us in the last election.
The truth is that by supporting this, the Koch Brothers and Ken Adleson are signing their own death warrants. The Democrats and unions then will have unlimited power, and will use it to crush them. 10 million illegals legalized equals 6 million votes for the Democrats and only 1 million for Republicans, which will result in Texas and other states becoming permanently blue.