About 400 people marched in downtown Houston today in support of immigrant rights, part of a nationwide Labor Day effort in advance of this month's congressional debate on immigration legislation. Marchers said they don't want top politicians to think they've forgotten the cause since the rallies last spring that drew tens of thousands of people to the streets. This time, they carried American flags and signs that said "Today we march. Tomorrow we vote." Leaders said the demonstrators advocate permanent legal residency for immigrants who cross the border illegally, as well as a higher minimum wage and bans on racial...