IT'S the fight of the sena vs the sena vs the sena. The three major contenders in the upcoming Uttar Pradesh elections—the BJP, Samajwadi Party and the Bahujan Samaj Party—have decided to field their own 'senas' (armies) for election duty. And with so many party 'senas' in the fray, Uttar Pradesh politics is taking on a decidedly 'militant' colour which could spell trouble for the state on the eve of the assembly elections.