Congress President Sonia Gandhi will flag off three-day bus yatra '27 Saal, UP Behal' on Saturday. Briefing media in New Delhi this evening, party leader Sanjay Singh said the yatra will propagate the message to the people of Uttar Pradesh about the failures of the successive governments. <br/><br/>Top party leaders will address people during the three day event. Asked when Priyanka Gandhi will be campaigning for the party, Mr Singh said as of now Ms Sonia Gandhi and Mr Rahul Gandhi will campaign. He said, whenever Priyanka's name will be decided for campaign, party will let everyone know.