Q: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer.
Avoid questions that can be answered correctly without actually understanding the paragraph. Avoid questions that do not link phrases referring to the same entity. Avoid questions that have multiple answers.

For each of your questions the answer should be one or more phrases in the paragraph. The answer for each question should be unambiguous.
Context: Beyonce and husband Jay Z are friends with President Barack Obama and First Lady Michelle Obama. She performed "America the Beautiful" at the 2009 presidential inauguration, as well as "At Last" during the first inaugural dance at the Neighborhood Ball two days later. Beyonce and Jay Z held a fundraiser at the latter's 40/40 Club in Manhattan for Obama's 2012 presidential campaign which raised $4 million. Beyonce uploaded pictures of her paper ballot on Tumblr, confirming she had voted in support for the Democratic Party and to encourage others to do so. She also performed the American national anthem at his second inauguration, singing along with a pre-recorded track. She publicly endorsed same sex marriage on March 26, 2013, after the Supreme Court debate on California's Proposition 8. In July 2013, Beyonce and Jay-Z attended a rally in response to the acquittal of George Zimmerman for the shooting of Trayvon Martin.
A:
Beyonce and Jay-Z went to a rally for the acquittal of whom?