Philippine opposition groups staged their biggest protest yet on Wednesday against President Gloria Macapagal, with analysts saying she may be threatened if her foes can stay united and beef up the size of rallies. Police said the crowd in Manila’s financial district peaked at about 30,000. The rally featured film stars, thumping music and chants for Arroyo to quit over allegations of vote-rigging in last year’s election and graft by members of her family. Full Stroy