New Delhi, Feb. 28 -- Michelle Obama, former First Lady of the US, is the leading choice to replace President Joe Biden as the Democratic party's candidate for the presidential elections, a poll has shown. Nearly half of the democrats - who voted in the Rasmussen Reports polls - expressed their choice for someone other than Biden to fight the US Presidential elections. About 48% of the Democrats polled said they approve of the party "finding another candidate to replace Joe Biden before the election in November," compared to 38% who disapprove. Only 33 per cent of Democrats believe there will be a ballot shakeup. Michelle Obama got about 20 per cent of votes among other options to replace 81-year-old Joe Biden. The other contenders were Vic...