In a major setback to Sharad Pawar’s Nationalist Congress Party (NCP) ahead of Maharashtra Assembly Elections, its Mumbai President Sachin Ahir joined the Shiv Sena on Thursday. Ahir and his wife Sangeeta was welcomed into the Sena by party chief Uddhav Thackeray and Yuva Sena president Aaditya Thackeray at a function in the Thackeray residence 'Matoshree' in Bandra.