CHISINAU - A presidential election in Moldova will to go to a second round, preliminary results showed early on Monday, after a pro-Russian socialist candidate fell short of winning sufficient support to achieve all-out victory.With 99.5 percent of votes counted, preliminary results showed candidate Igor Dodon, who wants to reverse Moldova's course towards European integration, had won 48.5 percent, and his main pro-European challenger, Maia Sandu, had 38.2 percent.Dodon needed to win 51 percent of the votes to avoid a run-off on Nov. 13.