Democratic presidential candidate Robert F. Kennedy Jr. delivers his political soapbox speech at the Iowa State Fair in Des Moines, Iowa, U.S. August 12, 2023. REUTERS/Scott Morgan/File Photo Acquire Licensing Rights WASHINGTON, Oct 5 (Reuters) - Anti-vaccine activist Robert F. Kennedy Jr., a member of one of the most storied American political families, could draw the support of about one in seven U.S. voters, according to a Reuters/Ipsos poll ahead of his presidential campaign's expected Monday launch. The poll found that Kennedy, the son and namesake of the slain U.S. senator, could draw votes away from both Democratic President Joe...