"I have hope in my heart that together we will start a new kind of politics, a politics in which all of you will be stakeholders - my young friends, my sisters and even the weakest person, all their voices will be heard", said Gandhi through the Congress's Shakti App.
Priyanka Gandhi, 47, scion of India's most prominent political family, made her political debut by holding a well-attended roadshow on Monday, ahead of general elections due by May.
Security personnel had a tough time holding back enthusiastic crowds as the convoy, which included other party leaders including state unit President Raj Babbar and General Secretary West Uttar Pradesh Jyotiraditya Scindia, wound its way amid full-throated slogans hailing Priyanka Gandhi and lampooning Prime Minister Narendra Modi.
Priyanka Gandhi Vadra is yet to make any tweet, but her fan following has been increasing since she joined the platform.
The Nehru-Gandhi family has had three prime ministers, including Jawaharlal Nehru, who was India's first prime minister and great grandfather of Rahul and Priyanka, followed by their grandmother Indira Gandhi and father Rajiv Gandhi.
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The ruling BJP has often criticized the Congress party for what they term "dynastic politics".
Posters of Priyanka lined the streets of the state capital, Lucknow, and hundreds of Congress supporters, accompanied by drummers, chanted her name as she emerged from the airport with her brother.
Her entry in politics came just weeks before the Lok Sabha polls are scheduled in the country.
A mother of two, Priyanka is married to a businessman Robert Vadra, who is being investigated for alleged charges of corruption in land deals. This ended last month when she accepted a key party post. "The youth of Uttar Pradesh need a roadmap for the future and the state needs change", he said.
Priyanka opened a Twitter account Monday and drew more than 85,000 followers in hours.