mexico is approaching land. it's also much worse than previously estimated. by one account, this could be nearly twice as bad as the exxon valdez spill. the burning question of course, how did this happen? we're keeping them honest. also tonight, what does an illegal immigrant look like? that's quote stirring passion on both sides of arizona immigration debate and now congress says it's going to get involved. the raw politics ahead. also getting involved, shakira. the grammy-award winning singer in phoenix, fighting against what she calls an unjust law, at one point asking a sheriff if he was going to arrest her as well. larry, those stories and much more at the top of the hour. >> that's 10:00 eastern, 7:00 pacific with sanjay gupta sitting in for anderson cooper. we're back with richardson and gonzales. first, let's check in again with carlos dias, downtown, l.a.'s famous alvera street. more opinions about the new law. >> in all honesty, we were