I've been saying the same for years! I got trashed here for bashing W over his non enforcement of immigration laws. I've been a single issue voter since 2005 and immigration is my issue. I did not vote McCain because of immigration, I did vote Romney because of his hard line on immigration. Right now I'd vote Cruz and I might vote Paul. Other then that I'll go 3rd party because the rest of the GOP field is very weak on illegal immigration.
I’m not sure Paul is for securing the border to be frank. And I think Walker is okay on the border issue - but Cruz is probably the safest bet.