NEW : With about 83 % of the vote in , Romney has 83 % of the primary vote in Puerto Rico . NEW : Romney and Santorum are locked in a tight race in Illinois . CNN now has zero delegates , more than twice anyone else , CNN estimates . Romney campaigned in Louisiana , while Santorum is in Puerto Rico .
NEW : With 83 % of the vote in , Romney has 83 % of the primary vote in Puerto Rico . NEW : Romney and Santorum are locked in a tight race in Illinois . Romney now has 518 delegates , more than twice anyone else , CNN estimates . Romney campaigned in Illinois , while Santorum is in Louisiana .