Bahujan Samaj Party (BSP) chief Mayawati was flanked by Samajwadi Party founder Mulayam Singh Yadav and his son Akhilesh Yadav today at a joint rally in Uttar Pradesh's Mainpuri, in a first-in-decades reunion loaded with political messaging in the middle of the national election, in which opposition parties are trying to stop the BJP from retaining power.