Federal bureaucrats call it the "border fence." The residents along the Texas-Mexico border say it's a wall echoing the Cold War. And south of the Rio Grande,Governor Humberto Moreira of the Mexican state of Coahuila has dubbed it a "wall of hate."But no matter what the controversial barrier being constructed between Mexico and the U.S. is called,the $1.6 billion,670-mile-long first phase is close to completion as President Barack Obama enters office. And for Obama,who voted for the border-fence bill back in 2006, the barrier may be best described as a big potential headache. Opponents are already appealing to him to...