BSP chief Mayawati, who cast her vote in Lucknow, appealed voters to exercise their franchise. Voting for the fifth phase of the Lok Sabha Elections is underway. Over 9 crore voters are exercising their franchise in 51 constituencies spread over seven states across India. UPA Chairperson Sonia Gandhi, Congress president Rahul Gandhi, Union Minister Rajnath Singh, Smriti Irani, Rajyavardhan Singh Rathore, actor-turned politician and Samajwadi Party candidate Poonam Sinha are some of the key contestants who will fight during the fifth phase of Lok Sabha polls today.