Des Moines, Iowa, Safar 10, 1433, Jan 4, 2012, SPA - The two top candidates in the opening contest of the US presidential race were in a photo finish Tuesday evening. Former Pennsylvania senator Rich Santorum and former Massachusetts governor Mitt Romney each stood at 25 per cent of the vote, with 97 per cent of results counted in the Iowa caucuses, launching the opposition Republican Party's process to pick a challenger to President Barack Obama, according to a report of the German Press Agency "DPA". --SPA 11:41 LOCAL TIME 08:41 GMT www.spa.gov.sa/958534