It would be staggering to imagine there will be permanent enemies and permanent friends in politics. Yet, the statement made by Samajwadi Party leader Mulayam Singh yesterday on Sonia Gandhi’s ‘‘Indianness’’ must send tectonic waves in the political field.Consider this: After being part of the shouting brigade to disallow foreigners to hold a constitutional post, Yadav declared in Etawah, his home constituency in Uttar Pradesh, that he would diasagree with anyone calling Sonia a foreigner.