The 37% number is based on political dynamics like the popularity of regional political parties and whether or not the political machinery is contesting in all

The 37% number is based on political dynamics like the popularity of regional political parties and whether or not the political machinery is contesting in all parts of the country. If you look at polling organizations that do "approval ratings" type of poll, they have been 50-70% for years. The recent West Bengal incursion is probably a good example, they went from no presence to becoming the primary opposition.