All six seats in Mumbai, the country's financial capital, are polling today in the fourth phase of the national elections. Reliance Group chairman Anil Ambani and veteran actor Rekha voted this morning. The Congress and its ally, Sharad Pawar's Nationalist Congress party or the NCP, are trying to wrest the six seats from the BJP-Shiv Sena combine. Last time, the Sena won three seats and the BJP three. Seventy two seats across nine states are polling in the fourth phase.