Border Security Force (BSF) soldiers keep guard as voters line up to cast their votes outside a polling booth in Nandigram, about 150 km (93 miles) southwest of Kolkata, May 7, 2009. Millions of Indians began voting in the fourth round of a general election on Thursday, including the possible swing state of West Bengal where the ruling Congress-led alliance hopes to win crucial seats. REUTERS/Jayanta Shaw (INDIA POLITICS ELECTIONS)