Voting for the fourth phase of the national election is taking place in the heartland states of Rajasthan and Madhya Pradesh today. The highlight of this round is Mumbai, the country's financial capital home to billionaires and celebrities. Six seats in Madhya Pradesh and 13 in Rajasthan are voting today. For the BJP, this round is crucial since it lost both states to the Congress in the December assembly elections. This round of voting involves 72 seats spread across nine states. The seven-phase election ends on May 19 and the results will be declared on May 23.