NEW DELHI The main power behind India's Hindu nationalist-led government wants the world's largest democracy to switch to a presidential system for better governance. Home Minister Lal Krishna Advani has called for a national debate to decide if India should continue with the Westminster parliamentary model introduced to the country after independence from Britain in 1947. Advani's move has sparked furious protests from the opposition, which suspects the call to be a deep-rooted conspiracy by Hindu nationalists to eventually do away with democracy.