Refer to explorations in literature for a complete version of this speech. which evidence from “the american promise” is sufficient to prove lyndon b. johnson’s argument that some americans are being tested unfairly when they try to vote? “experience has clearly shown that the existing process of law cannot overcome systematic and ingenious discrimination.” “he may be asked to recite the entire constitution, or explain the most complex provisions of state law.” "no law that we now have on the ensure the right to vote when local officials are determined to deny it.” "the negro citizen may go to register only to be told that the day is wrong, or the hour is late, or the official in charge is absent."