Inspired by the millions of immigrants who took to the streets to demand legal residency, Latino advocacy groups and politicians have called for a national Latino congress to keep the issue in the political spotlight. Organizers are inviting leaders from across the political spectrum to Los Angeles -- the country's Latino epicenter -- to draft an agenda to strengthen immigrant rights, health care and education. "These mobilizations have shown that the immigrant community and the Latino community have political potential in impacting public policy,'' said Angela Sanbrano, president of the National Alliance of Latin American and Caribbean Communities. "But we...