new york democratic presidential nominee hillary clinton lead republican rival donald trump 12 percentage point among likely voters strong show month accord reuters/ipsos opinion poll release tuesday aug. 18-22 poll show 45 percent voters support clinton 33 percent back trump ahead nov. election clinton former u.s. secretary state lead trump new york businessman throughout 2016 campaign late lead represent strong level support poll indicate past weeks early august clinton lead trump range percentage point poll poll also find 22 percent likely voters would pick either candidate lack support high compare people respond poll 2012 presidential election democratic president barack obama republican mitt romney waver right likely think support third-party candidate instead clinton trump say tom smith direct center study politics society university chicago late poll clinton face renew scrutiny handle classify email serve secretary state 2009 2013 trump campaign chief paul manafort resign reshuffle candidate campaign leadership team clinton hold small lead separate four-way poll include libertarian nominee gary johnson jill stein green party among likely voters 41 percent support clinton 33 percent back trump johnson back percent stein percent reuters/ipsos poll conduct online english 50 state presidential poll include 1,115 respondents credibility interval measure accuracy percentage point clinton lead trump 12 point reuters/ipsos poll