Parties Set Stage for Showdown on Court Choice
Democratic leader Sen Harry Reid warns Pres Bush not to pick Judge Samuel A Alito Jr as Supreme Court nominee, saying it 'would create a lot of problems'; Reid has already said he would object to selection of two others said to be on Bush's short list, Judge J Michael Luttig and Judge Priscilla R Owen; they and fourth judge under consideration, Alice M Batchelder, all have kind of clear record and judicial credentials prominent conservatives are hoping for; liberal groups gird for battle to oppose them, as Reid hints that Democrats would try to block nominee by filibuster or refusing to close debate and vote; Republican Sen Lindsey Graham says any filibuster against Alito or Luttig because of their conservatisim 'will not stand'; his warning seen as significant because of crucial role he played earlier this year in helping to block Republican effort to change Senate rules on filibusters of judicial nominees (M)

