Final answer:
Joe Biden is a member of the Democratic Party, which is one of the two main political parties in the U.S. alongside the Republican Party.
Step-by-step explanation:
Joe Biden belongs to the Democratic Party, which is one of the two major political parties in the United States. The Democratic Party is known for its liberal and progressive stances on a variety of issues, such as social equality, environmental policies, and healthcare reform. The United States operates under a two-party system, predominantly made up of the Democratic and Republican parties.
Although there are other parties like the Green Party and the Libertarian Party, they remain as third parties with significantly less influence compared to the two main parties. Biden's affiliation with the Democratic Party connects him to a historical line of politicians who have shaped the party's values and policies over time.