LOS ANGELES - Hundreds of thousands of mostly Hispanic immigrants skipped work and took to the streets Monday, flexing their newfound political muscle in a nationwide boycott that succeeded in slowing or shutting many farms, factories, markets and restaurants. From Los Angeles to Chicago, New Orleans to Houston, the "Day Without Immigrants" attracted widespread participation despite divisions among activists over whether a boycott would send the right message to Washington lawmakers considering sweeping immigration reform. "I want my children to know their mother is not a criminal," said Benita Olmedo, a nanny who came here illegally in 1986 from Mexico...