<page_title> 2012 Democratic Unity Roundtable presidential primary </page_title> <section_title> Opinion polls </section_title> <table> <cell> Diego Arria <col_header> Source </col_header> </cell> <cell> Henrique Capriles <col_header> Date </col_header> </cell> <cell> Leopoldo López <col_header> Sample </col_header> </cell> <cell> María Corina Machado <col_header> Void/Null </col_header> </cell> <cell> Pablo Medina <col_header> DiegoArria.jpeg </col_header> </cell> <cell> Pablo Pérez <col_header> - </col_header> </cell> </table>
The registration process for presidential candidates was attended by Leopoldo López, María Corina Machado, Henrique Capriles, Pablo Pérez, Pablo Medina and Diego Arria.