* Protest at what demonstrators say is Sunni marginalisation
* Shi'ite PM Maliki facing re-election in April
* Sunni deputies offer resignation from parliament (Adds resignations offered by Sunni members of parliament, new attacks)
By Kamal Namaa
RAMADI, Iraq (Reuters) - Fighting erupted when Iraqi police broke up a Sunni Muslim protest camp in the western Anbar province on Monday, ...