Groups decided not to hold conventions in Arizona because of new immigration law . Law allows police to ask anyone for proof of being in Arizona legally . Opponents say it will lead to racial discrimination ; supporters disagree . National Committee of La Raza leads the groups ' call for boycott .
Groups pledge not to hold conventions in Arizona because of new immigration law . Law allows police to ask anyone for proof of being in U.S. legally . Opponents say it will lead to racial profiling ; supporters disagree . National Council of La Raza leads rights groups ' call for boycott .