Who is Robert F. Kennedy Jr. and why is he running for president?

The lack of excitement many Americans feel about a presidential rematch has heightened interest in alternatives to the major-party candidates, none more so than Robert F. Kennedy Jr., whose famous name has helped him build buzz for his independent bid. Kennedy is a huge longshot to win Electoral College votes, much less the presidency. But his campaign events have drawn large crowds of supporters and people interested in his message. He plans to announce his vice presidential nominee later…