Conversation so far:
What were some of Joe Biden's early senate activities?
During his first years in the Senate, Joe Biden focused on legislation regarding consumer-protection and environmental issues and called for greater accountability on the part of government.
Was Joe Biden successful in focusing on legislation regarding consumer-protection and environmental issues and calling for greater accountability on the part of government?
In mid-1974, freshman Senator Joe Biden was named one of the 200 Faces for the Future by Time magazine.
Did Joe Biden win any awards?
In January 2017, Barack Obama awarded Joe Biden the Presidential Medal of Freedom with distinction.
Are there any other interesting aspects about the Joe Biden article besides being awarded the Presidential Medal of Freedom with distinction?
Joe Biden declined Barack Obama's first request to vet him for the vice presidential slot, but subsequently changed his mind.
Why did Joe Biden change his mind about declining Barack Obama's first request to vet him for the vice presidential slot?
Is there anything else noteworthy about Joe Biden's early senate activities besides focusing on legislation regarding consumer-protection and environmental issues and calling for greater accountability on the part of government?
Joe Biden clashed again with the Reagan administration in 1986 over economic sanctions against South Africa.

Question: Why did they clash?
Self-contained rewrite: Why did Joe Biden and the Reagan administration clash?