When civil-rights activists converge on Selma's Edmund Pettus Bridge next Saturday, they'll have a bigger goal than simply commemorating the 50th anniversary of "Bloody Sunday." The 1965 march from Selma to Montgomery, Alabama, helped secure the passage of the Voting Rights Act. This year, dozens of politicians will be there to join the celebration, and activists hope to persuade them that a better way to honor Selma's legacy is to extend the legal protections it secured.