Kumar today met Congress MLAs here, seeking their support for the July 17 presidential election.
Speaking to media later, she said the presidential election is being contested on the basis of ideology for the first time.
Asked about the contest being described as "Dalit versus Dalit" (as the NDA's candidate Ram Nath Kovind too is a Dalit), Kumar said, "I am both happy and pained over this.
"I feel sad when the election is described as a Dalit vs Dalit contest.
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"Presidential elections were held many times in the past and whenever two people from the so-called upper castes contested, the discussion would be about their (respective) achievements, their abilities, their qualities. Their caste was never discussed. But when I and Kovind-ji are contesting, nothing is being discussed beyond (both being) Dalit," Kumar said.
Stating that incidents of atrocities on Dalits and tribals have increased, she said, "We are fighting this election to raise their voice."
For the first time, 17 opposition parties have decided to contest the election jointly on the basis of "ideology, principles and values which we have inherited from our ancestors", and this is an important event in the history of Indian politics, Kumar said.
"I have requested MLAs and MPs to cast their votes keeping in view the nation's interest. Otherwise, future generation would ask them why they chose a path leading towards darkness, where people are divided in the name of religion and caste," she said.