Its time for the big guns to come out in poll bound Uttar Pradesh. State Chief Minister Mayawati and Congress President Sonia Gandhi both begin their U.P campaign with public rallies today. For Mayawati, the challenge is to hold on to her dalit vote bank and tide over the anti-incumbency factor. For Sonia, the challenge is to turn the Congress' fortunes around in a state that has disappointed the party for 2 decades. It is clear from the Congress manifesto that it is targeting the vast minority votes in the state. BSP's primary concern is to keep its dalit vote bank intact. For more log onto: http://alpha.newsx.com