Bob Barr's immigration position appears to simply be a copy of John McCain's. He says he supports border security, but so does most everyone else. He's also hinted that he supports a massive amnesty for current illegal aliens. He did that in the context of offering a false choice: he pretended that we have to choose between a massive amnesty and mass deportations. Like Barack Obama, Hillary Clinton, and John McCain, he failed to note a third possibility of simply enforcing our laws to encourage current illegal aliens to return home ("attrition").
Those expecting him to run an outsider, insurgent campaign should find someone else.