UP is the country's most important state politically — sending 80 members to the Lok Sabha.
On Monday, Priyanka and the other Congress leaders rode out of the Lucknow airport on an open-top bus.
"It's like Indira Gandhi has come back," Reuters reported Fuzail Ahmed Khan, 45, a Congress supporter as saying. "The state's farmers want Rahul Gandhi to be prime minister, Priyanka to be chief minister."
As Priyanka's cavalcade rolled through the streets of Lucknow, Congress workers showered rose petals and threw marigold garlands at her.
Some posters showed Priyanka Gandhi as Goddess Durga on a lion.
#Visuals from Congress' roadshow in Lucknow. General Secretary for Uttar Pradesh East Priyanka Gandhi Vadra, General Secretary for Uttar Pradesh West Jyotiraditya Scindia and party President Rahul Gandhi are crossing Transport Nagar pic.twitter.com/MbKZc4fNnF
#Visuals: Congress General Secretary for Uttar Pradesh East Priyanka Gandhi Vadra interacts with a child during the roadshow in Lucknow. The girl says, "I gave her a garland & she gave me a chocolate. Later, she returned the garland to me & said, 'Stay happy'. pic.twitter.com/0h9PPYCiCm