I believe you mean "moderating," although at times it probably does seem like mediating. The moderator for the 2012 vice presidential debate was Martha Raddatz, a veteran news-woman for ABC, with expertise in foreign policy.
State of the Union with John King - 2009 Gun Control Debate Vice President Biden was released on: USA: 13 January 2013
The Vice President of the United States serves as the presiding officer of the Senate. In this role, the Vice President can cast tie-breaking votes but does not participate in debate except to break a tie. When the Vice President is absent, the Senate appoints a President pro tempore to preside over sessions.
It was mostly about foreign policy, although they covered healthcare as well. Vote Romney Ryan!!
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Vice President Richard Nixon challenged Soviet Premier Nikita Khrushchev in the famous "kitchen debate" during an exhibition in Moscow in 1959. The debate centered around the merits of capitalism versus communism, with Nixon showcasing the advantages of American consumer goods and lifestyle. This encounter highlighted the ideological rivalry of the Cold War era.
Vice President
vice president until presidents term is up.
The vice president is selected by the canidates and if they win the vice president they chose becomes vice president.
The Vice President is the President of the Senate.
vice president
vice president
In USA executive ranks, a Group Vice President is at the same level as an Executive Vice President. A Group Vice President ranks above a Senior Vice President and a Vice President, and will typically have multiple Senior Vice Presidents and/or Vice Presidents reporting to them.