Congress's Sonia Gandhi, announcing the party's huge public outreach initiative today, tossed a small 'challenge' at its "seniors". The party has planned a massive Kashmir to Kanyakumari "Bharat Jodo Yatra" starting on Mahatma Gandhi's birth anniversary on October 2. "All of us will participate in it. The Yatra is to strengthen the bonds of social harmony that are under stress, to preserve the foundational values of our Constitution that are under assault and to highlight the day-to-day concerns of crores of our people," she said on the concluding day of the three-day Chintan Shivir.