NAIROBI (Reuters) - Kenya opposition leader Raila Odinga said on Tuesday he would use pickets and petitions to protest last week s presidential poll and convene a  People s Assembly  to try to improve governance but made no mention of challenging the result.  We will guard our right to dissent by exercising it,  Odinga said in a long-awaited television address. He emphasized that he wanted to limit his protests to well-recognised, legal avenues. 