new york republican presidential nominee donald trump pull nearly even democratic rival hillary clinton first time since may accord reuters/ipsos poll take course republican national convention cleveland week july 18-22 national online poll find 41 percent likely voters support clinton 38 percent support trump give poll credibility interval percentage point trump clinton consider even race election 2016 coverage republicans open convention monday trump trail clinton nearly 10 percentage point poll new york businessman-turned-politician formally accept republican nomination nov. presidential election convention party time struggle show unity week start dustup convention leaders delegate want change party rule derail trump nomination late week senator ted cruz texas drop nomination race may refuse endorse trump prime-time speech yet final night convention republicans give trump stand ovation pledge take back country say plague crime terrorism ineffective leadership party conventions partly mean introduce candidate country nominees tend get boost opinion poll afterward 2012 then-republican nominee mitt romney rise percentage point reuters/ipsos poll party convention clinton expect formally nominate party convention philadelphia next week lead trump year poll last time trump draw even clinton mid-may last two rival republican nomination drop race party leaders start get behind campaign reuters/ipsos poll conduct english 50 state 1,036 likely voters trump pull nearly even clinton republican convention reuters/ipsos poll