Robert F. Kennedy Jr. announces independent presidential candidacy.
Ends Democratic primary challenge against Joe Biden.
Plans campaign events across the U.S.
Aims to gain ballot access in all states.
Acknowledges the challenge for independent candidates.
Polls show Kennedy with some support but uncertain impact.
Polls show Kennedy with some support but uncertain impact.
Kennedy aims to attract both Biden and Trump supporters.
Family members criticize his decision to run independently.
Kennedy advocates for a two-party system reform.