Leonard Pitts: There are some people who just don’t matter much

There are people who do not matter much.That's a painful truth, starkly at odds with our Jeffersonian creed and national mythology. But it is a truth, nevertheless, one frequently proven in actions if denied in words.In this country, by dint of race, gender, class or status, some people just don't seem to matter. Apparently, Tammy Jackson is one of them.No other conclusion is possible after reading the May 3 letter her public defender, Howard Finkelstein, sent to Broward County, Florida, Sheriff