The border will also have to be demarcated, including the tinderbox Abyei area, where Arab nomads historically have crossed back and forth.
Asked to recall people who have crossed back and forth between television and campaigning in previous years, executives say only one big name comes to mind, Pat Buchanan, who was a co-host of CNN's "Crossfire" between his failed Republican presidential bids in the 1990s.
But Sandoval and Tambini also make it clear that Arizona itself is a victim of unintended consequences, federal immigration policies having encouraged workers who once would have crossed back and forth across a more open border to remain in the U.S., and, by fencing off the borders of neighboring Southwest states, to turn Arizona into a sort of funnel for immigrants and smugglers alike.
Residents of Jacumba, Calif., and Jacume, Mexico, who once freely crossed back and forth, complain that reinforced fencing has severed generation-long ties.
Until recently Mexicans crossed back and forth across the border as work and family demanded.
What's more, whereas previous waves of immigrants, crossing over the permeable border at the Rio Grande, would come and go as they pleased, the more recent crop of outlaws have found the risk of crossing back and forth to be too severe, and so many of them have simply decided to stay.
And Indian tribes in this indigenous reserve have never recognised the border, crossing back and forth to visit their ancestral territories.
Ankara has long been accused of failing to take adequate action against jihadists crossing back and forth from Turkey into Syria.
Passes through the peaks and folds of the mountains have enabled thousands of hardy militants to cross back and forth across the line.
On the whole, though, we have around 200 crossings a day, but those aren't independent payers because people cross back and forth.
