I don't know if this has been extensively discussed already (I've been off the forum for awhile) but I came across a Ron Paul campaign pamphlet the other day and was impressed by his stance on immigration:

"There are upwards of 11 million illegal immigrants living the U.S. amassing an annual cost of $113 billion to U.S. taxpayers. Ron Paul endorses increased security to secure the border, and opposes federal entitlements and amnesty to remove incentives to illegally immigrate in the first place."

I'm still voting for Romney but that sounds pretty good to me.