Question: The Make America Number 1 super PAC's largest donor is better known as whom?

Context paragraphs:
Vote Climate U.S. PAC: Vote Climate U.S. PAC is an American super PAC founded in 2013 and directed by American political activist Karyn Strickler.  Its mission is "to elect candidates to get off fossil fuels, transition to clean, renewable energy and put a price on carbon, in order to slow global warming and related weather extremes."  Strickler has named the implementation of a carbon tax as a principal goal.  As a super PAC (a type of political action committee), the organization cannot contribute to candidates but can make independent expenditures on their behalf.

Priorities USA Action: Priorities USA Action is the largest Democratic Party super PAC.  Founded in 2011, it supported Barack Obama's 2012 re-election campaign.  It was the primary super PAC supporting Hillary Clinton's 2016 presidential campaign.  It focused mainly on high-dollar donors.  As of September 2016, it had amassed $132 million in support of Clinton.  The top six donors to the super PAC have given $43.5 million, which is a third of the money collected by Priorities USA Action in the 2016 election cycle.  The super PAC raised $21.7 million in August 2016, marking its largest monthly fundraising haul.

Robert Mercer (businessman): Robert Leroy Mercer (born July 11, 1946), better known as Bob Mercer, is an American computer scientist, a developer in early artificial intelligence, and co-CEO of Renaissance Technologies, a successful hedge fund.

Big Joe (bell): Joseph (commonly known as Big Joe) is a bronze bell that hangs 125 ft into the bell tower of Neo-Gothic Saint Francis De Sales Catholic Church in Cincinnati, Ohio, United States.  The endearing moniker Big Joe is a combination of the names of Joseph T. Buddeke, the largest donor of the project, and Big Ben, the great bell in the iconic Palace of Westminster clock tower in London.

Rebuilding America Now: Rebuilding America Now is a political action committee (PAC) created to support Donald Trump's 2016 presidential campaign.  A so-called Super PAC, Restore America Now is permitted to raise and spend unlimited amounts of corporate, union, and individual campaign contributions under the terms of the "Citizens United" Supreme Court decision.

Make America Number 1: Make America Number 1 is a super PAC (political action committee) that supported the presidential campaigns of Ted Cruz and Donald Trump in the 2016 United States presidential election.  During the primary campaign, the super PAC was known as Keep the Promise I.  In the general election, it informally termed itself Defeat Crooked Hillary PAC.  The PAC is run by Rebekah Mercer, the second daughter of its largest donor Robert Mercer .

Great America PAC: Great America PAC is a Super PAC that supported Donald Trump in the 2016 Presidential Election.  It was founded in 2016 by Eric Beach, a political strategist who is a veteran of presidential campaigns.  Beach soon brought on Ed Rollins, a long time Republican campaign consultant and strategist who served as the campaign manager for Ronald Reagan's 1984 presidential campaign.

Texas Patriots PAC: Texas Patriots PAC is a Super PAC based in The Woodlands in southeastern Texas.  The group gained national attention when it hosted a Republican presidential debate in November 2011 between candidates Herman Cain and Newt Gingrich.  The debate was conducted in the "Lincoln-Douglas" style, which Gingrich then went on to make a central theme of his campaign, promising to challenge President Obama to seven "Lincoln-Douglas" style debates, at three hours each, should he win the GOP nomination.

America Rising: America Rising is a political action committee (PAC) that produces opposition research on Democratic Party members.  It is located in Alexandria, Virginia.  It was founded in March 2013 by Mitt Romney's 2012 presidential campaign manager, Matt Rhoades.  Political strategist Tim Miller left the Republican National Committee (RNC) to join the clearinghouse.  As of January 2014, between the PAC and the LLC run by fellow opposition research veteran Joe Pounder, the organization employed 47 people, full or part-time.  CNN reported that America Rising would be split into two entities: a super PAC that aimed to spread negative stories about congressional Democratic incumbents and candidates through digital channels and earned media, and an LLC that would house a video library to be shared with GOP candidates, the RNC and other right-leaning groups.  To avoid making illegal in-kind corporate contributions, the LLC would likely need to charge candidates for access to the library.  Pounder and Miller estimated it would have a budget of between $10 and $15 million for the 2013-2014 election cycle.

Colbert Super PAC: Americans for a Better Tomorrow, Tomorrow (better known as the Colbert Super PAC) was a United States political action committee (PAC) established by Stephen Colbert, who portrayed Dr. Stephen T. Colbert, a mock-conservative political pundit on Comedy Central's satirical television series "The Colbert Report".  As a super PAC the organization could raise unlimited sums of money from corporations, unions and other groups, as well as wealthy individuals.  Speaking in character, Colbert said the money would be raised not only for political ads, but also "normal administrative expenses, including but not limited to, luxury hotel stays, private jet travel, and PAC mementos from Saks Fifth Avenue and Neiman Marcus."

Supporting paragraphs: Make America Number 1 Robert Mercer (businessman)
Answer: Bob Mercer