Question: An American statistician and writer who analyzes baseball cited Leip's Atlas as what?

full_context: Document 1: Dave Leip's Atlas of U.S. Presidential Elections: Dave Leip's Atlas of U.S. Presidential Elections is a web site that provides tables, graphs, and maps for presidential (1789–present), senatorial (1990 and onwards), and gubernatorial (1990 and onwards) elections. Data include candidates, parties, popular and electoral vote totals, and voter turnout. County-level data is available for many years, and all data are compiled from official sources. Leip's Atlas has been cited as a "preferred source for election results" by statistician and political pundit Nate Silver.
Document 2: United States presidential election: The election of President and Vice President of the United States is an indirect election in which citizens of the United States who are registered to vote in one of the 50 U.S. states or Washington, D.C. cast ballots for members of the U.S. Electoral College, known as electors. These electors then in turn cast direct votes, known as electoral votes, for President and Vice President. The candidate who receives an absolute majority of electoral votes for President or Vice President (currently, at least 270 out of a total of 538) is then elected to that office. If no candidate receives an absolute majority for President, the House of Representatives chooses the President; if no one receives a majority for Vice President, then the Senate chooses the Vice President.
Document 3: Steve Kettmann: Kettmann, despite having written on a wide variety of topics, is best known for his work on several baseball books, most recently "Baseball Maverick: How Sandy Alderson Revolutionized Baseball and Revived the Mets" (Grove Atlantic, April 2015). The book explores Alderson's role as general manager of the Oakland A's in the 1980s and 1990s, including his role as a mentor to the young Billy Beane, who was later made famous in the movie adaption of the Michael Lewis book "Moneyball". It also focuses on Alderson's years as general manager of the New York Mets starting in late 2010.
Document 4: United States presidential election in Utah, 2012: The 2012 United States presidential election in Utah took place on November 6, 2012 as part of the 2012 General Election in which all 50 states plus The District of Columbia participated. Utah voters chose six electors to represent them in the Electoral College via a popular vote pitting incumbent Democratic President Barack Obama and his running mate, Vice President Joe Biden, against Republican challenger and former Massachusetts Governor Mitt Romney and his running mate, Congressman Paul Ryan. Prior to the election, all 17 news organizations considered this a state Romney would win, or otherwise considered as a safe red state. Utah is among the most heavily Republican states, voting for the Republican ticket in every presidential election since 1968, and is also the only state to have a majority Mormon population, benefiting Romney, the first Mormon to head a major party presidential ticket. He carried every county in the state, all by large margins. However, Obama would go on to win reelection nationwide.
Document 5: Verrit: The website's slogan says it is "media for the 65.8 million," referring to the number of votes Hillary Clinton won in the 2016 presidential election. Daou, an adviser to Clinton's 2008 presidential campaign, and prior chief executive of Shareblue told "Business Insider" that he intended the website to "reflect the worldview" of those who voted for Clinton and described the site as an "online hub for Clinton backers so that they can find easy-to-share facts, stats and other information you can take out to social media when you’re having debates on key issues people are discussing". Daou also said the website had no financial ties to Clinton.
Document 6: Purple America: Purple America is the belief that a more detailed analysis of the voting results of recent United States national elections reveals that the U.S. electorate is not as polarized between "Red" America (Republican) and "Blue" America (Democratic) as is often depicted in news analysis. The term reflects the fact that news organizations generally use the colors red and blue on maps to indicate when a state or congressional district has been won by a Republican or Democratic candidate, respectively. Because the American political system often awards a state or congressional district entirely to one candidate ("winner take all") without regard to the margin of victory, it results in a map that does not reflect the true distribution of "red" or "blue" votes across the nation. The distortions contained in these maps, the argument goes, contribute to the misperception that the electorate is highly polarized by geography.
Document 7: National Historical Geographic Information System: The National Historical Geographic Information System (NHGIS) is a historical GIS project to create and freely disseminate a database incorporating all available aggregate census information for the United States between 1790 and 2010. The project has created one of the largest collections in the world of statistical census information, much of which was not previously available to the research community because of legacy data formats and differences between metadata formats. The statistical and geographic data are disseminated free of charge through a sophisticated online data access system.
Document 8: Nate Heisler: Nate Heisler is a MLBPA certified sports agent at Beverly Hills Sports Council. Heisler represents Major League Baseball players
Document 9: Carl Bialik: Carl Bialik is an American journalist, who on February 6, 2017, was named Data Science Editor of Yelp, working on Yelpblog. Prior to this, Bialik was known for his work for "The Wall Street Journal's" web site, and the paper itself. He is also a co-founder of the growing online-only "Gelf Magazine". In late 2013, Bialik was hired by Nate Silver at FiveThirtyEight.com.
Document 10: Dean Oliver (statistician): Lawrence Dean Oliver (born February 6, 1969) is an American statistician who is prominent contributor to the statistical evaluation of basketball, sometimes called APBRmetrics after the forum of a growing community of basketball analysts. He is the author of "Basketball on Paper", the former producer of the defunct Journal of Basketball Studies. More recently, Oliver has served in front office roles with the Sacramento Kings, Seattle SuperSonics and Denver Nuggets of the NBA (including when the controversial trade for Allen Iverson was made). In October 2015 Dean Oliver joined TruMedia Networks as Vice President of Data Science. TruMedia Networks is an engineering firm specializing in sports analytics solutions for leagues, franchises and media partners, and says of Oliver in a press release announcing Dean Oliver's hiring, "Oliver was most recently in the front office of the Sacramento Kings and is considered one of the best minds in the world of sports analytics."
Document 11: Bill James: George William James (born October 5, 1949) is an American baseball writer, historian, and statistician whose work has been widely influential. Since 1977, James has written more than two dozen books devoted to baseball history and statistics. His approach, which he termed sabermetrics in reference to the Society for American Baseball Research (SABR), scientifically analyzes and studies baseball, often through the use of statistical data, in an attempt to determine why teams win and lose. His "Baseball Abstract" books in the 1980s are the modern predecessor to websites using sabermetrics such as Baseball Prospectus and Baseball Primer (now Baseball Think Factory).
Document 12: Nate Silver: Nathaniel Read Silver (born January 13, 1978) is an American statistician and writer who analyzes baseball (see sabermetrics) and elections (see psephology). He is the editor-in-chief of ESPN's "FiveThirtyEight" and a Special Correspondent for ABC News. Silver first gained public recognition for developing PECOTA, a system for forecasting the performance and career development of Major League Baseball players, which he sold to and then managed for Baseball Prospectus from 2003 to 2009.
Document 13: FiveThirtyEight: FiveThirtyEight, sometimes referred to as 538, is a website that focuses on opinion poll analysis, politics, economics, and sports blogging. The website, which takes its name from the number of electors in the United States electoral college, was founded on March 7, 2008, as a polling aggregation website with a blog created by analyst Nate Silver. In August 2010, the blog became a licensed feature of "The New York Times" online. It was renamed FiveThirtyEight: Nate Silver's Political Calculus. In July 2013, ESPN announced that it would become the owner of the FiveThirtyEight brand and site, and Silver was appointed as editor-in-chief. The ESPN-owned FiveThirtyEight began publication on March 17, 2014. In the ESPN era, the FiveThirtyEight blog has covered a broad spectrum of subjects including politics, sports, science, economics, and popular culture.
Document 14: W. Phillips Shivley: W. Phillips Shively is Professor of Political Science at the University of Minnesota. He has also taught at the University of Oregon and Yale University, and has been a visiting professor at the University of Oslo. His research deals with the comparative study of elections, and with methods of data analysis. He is the author (with Chris Achen) of Cross-Level Inference and of a textbook, The Craft of Political Research first published in 1974 now in its eighth edition, He is the author of text book Power and Choice : Introduction to Political Science now on its 14th edition. as well as numerous articles on elections and on methods of analysis. He has served as editor of the American Journal of Political Science and as chair and principal investigator of the Comparative Study of Electoral Systems project, as well as various administrative positions at the University of Minnesota. His true love is natural history. influential research methods text "The Craft of Political Research"
Document 15: Pete Palmer: Pete Palmer (born January 30, 1938) is an American sports statistician and encyclopedia editor. He is a major contributor to the applied mathematical field referred to as sabermetrics. Along with the Bill James "Baseball Abstracts", Palmer's book "The Hidden Game of Baseball" is often referred to as providing the foundation upon which the field of sabermetrics was built.
ground_truth: "preferred source for election results"