RFK Jr ends US presidential campaign, endorses Trump. How will it affect the race?

Republican presidential nominee and former U.S. President Donald Trump shakes hands with former independent presidential candidate Robert F. Kennedy Jr. Friday during a rally in Glendale, Ariz. (REUTERS/Go Nakamura)

Independent presidential candidate Robert F. Kennedy Jr. abandoned his campaign on Friday and endorsed Republican Donald Trump, ending a run that he began as a Democrat trading on one of the most famous names in American politics.