By Tim Reid DES MOINES, Iowa (Reuters) -Republican rivals Ron DeSantis and Nikki Haley jockeyed on Wednesday to emerge as the clear alternative to frontrunner Donald Trump just days before voting in the presidential primary race kicks off in Iowa. Here are takeaways from their first head-to-head debate: CANDIDATES ATTACK EACH OTHER, GO EASY ON TRUMP If there were any doubts that the current race for the Republican presidential nomination is a second-place fight between Haley and DeSantis behind Trump, the debate’s opening salvos dispelled them. Haley and DeSantis immediately went on the attack…