Washington, Jumada II 9, 1435, Apr 9, 2014, SPA -- Hillary Clinton is the favourite among Democratic voters in the mid-western state of Iowa, where the next US presidential campaign will begin in 2016, dpa cited a poll released Wednesday, as saying. But the survey "shows no favourites" among prospective Republican candidates, Suffolk University in Boston said in the poll. With President Barack Obama's re-election little more than a year ago, the US political apparatus is already gearing up for the next round. The Iowa caucuses in early January 2016 will kick off the state-by-state primary voting process in which the parties decide their candidate for the presidency. The mid-western state is a "must" stop for candidates in the six-month nominating process. In the poll, 63 per cent of Democratic voters preferred former first lady and secretary of state Clinton, 12 per cent tipped for Senator Elizabeth Warren of Massachusetts and only 10 per cent for Vice President Joe Biden. -- SPA 20:28 LOCAL TIME 17:28 GMT www.spa.gov.sa/1219110