LUCKNOW , April 19 -- After having been bitter political rivals for 24 years, Bahujan Samaj Party president Mayawati and Samajwadi Party (SP) patriarch Mulayam Singh Yadav will be seen together on Friday when the BSP chief, along with her SP and RLD counterparts Akhilesh Yadav and Ajit Singh, will seek votes for the senior Yadav at a joint rally in Mainpuri....