Question: Khizir Khan spoke at the convention in Philadelphia that nominated which person for Democratic presidential candidate?

Context paragraphs:
Libertarian Party presidential primaries, 2016: The 2016 Libertarian Party presidential primaries and caucuses allowed electors to indicate non-binding preferences for the Libertarian Party's presidential candidate.  These differed from the Republican or Democratic presidential primaries and caucuses in that they did not appoint delegates to represent a candidate at the party's convention to select the party's nominee for the United States presidential election.  The party's nominee for the 2016 presidential election was chosen directly by registered delegates at the 2016 Libertarian National Convention, which ran from May 26 to 30, 2016.  The delegates nominated former New Mexico Governor Gary Johnson and former Massachusetts Governor Bill Weld.

Game Change: Game Change: Obama and the Clintons, McCain and Palin, and the Race of a Lifetime is a book by political journalists John Heilemann and Mark Halperin about the 2008 United States presidential election.  Released on January 11, 2010, it was also published in the United Kingdom under the title Race of a Lifetime: How Obama Won the White House.  The book is based on interviews with more than 300 people involved in the campaign.  It discusses factors including Democratic Party presidential candidate John Edwards' extramarital affair, the relationship between Democratic presidential nominee Barack Obama and his vice presidential running mate Joe Biden, the failure of Republican Party candidate Rudy Giuliani's presidential campaign and Sarah Palin's vice presidential candidacy.

2016 Democratic National Convention: The 2016 Democratic National Convention was a presidential nominating convention, held at the Wells Fargo Center in Philadelphia, Pennsylvania, from July 25 through to July 28, 2016.  The convention gathered delegates of the Democratic Party, the majority of them elected through a preceding series of primaries and caucuses, to nominate a candidate for president and vice president in the 2016 United States presidential election.  Former U.S. Secretary of State, Hillary Clinton, was chosen as the party's nominee for president by a 59.67% majority of delegates present at the convention roll call, defeating primary rival Senator Bernie Sanders, who received 39.16% of votes from delegates, and becoming the first female candidate to be formally nominated for presidential by a major political party in the United States.  Her running mate, Senator Tim Kaine from Virginia, was confirmed by delegates as the party's nominee for vice president by acclamation.

New Frontier: The term New Frontier was used by liberal Democratic presidential candidate John F. Kennedy in his acceptance speech in the 1960 United States presidential election to the Democratic National Convention at the Los Angeles Memorial Coliseum as the Democratic slogan to inspire America to support him.  The phrase developed into a label for his administration's domestic and foreign programs.

Khizr and Ghazala Khan: Khizr Muazzam Khan (born 1950) and Ghazala Khan (born 1951) are the Pakistani American parents of United States Army Captain Humayun Khan, who was killed in 2004 during the Iraq War.  The couple received international attention following a speech at the 2016 Democratic National Convention that criticized Republican presidential candidate Donald Trump.

Finnish presidential election, 1978: Two-stage presidential elections were held in Finland in 1978, the first since 1968 after Urho Kekkonen's term was extended by four years by Parliament.  The public elected presidential electors to an electoral college on 15 and 16 January.  They in turn elected the President.  The result was a victory for Urho Kekkonen, who won on the first ballot.  The turnout for the popular vote was 64.3.  Kekkonen had in the spring of 1975 agreed to become the Social Democratic presidential candidate, and after that all the major Finnish political parties chose him as their candidate.  Kekkonen's opponents, such as the Christian League's presidential candidate Raino Westerholm, claimed that Kekkonen's long presidency weakened the Finnish democracy.  Over one-third of the Finnish voters abstained from voting, partly as a protest against Kekkonen's expected landslide victory.  The 77-year-old President Kekkonen's health was already declining, although this fact was not easily noticeable in his public appearances (see, for example, Timo Vihavainen, "The Welfare Finland" (Hyvinvointi-Suomi), pgs.  883-884 in Seppo Zetterberg et al., eds., A Small Giant of the Finnish History / Suomen historian pikkujättiläinen.  Helsinki: WSOY, 2003; Pentti Virrankoski, A History of Finland / Suomen historia, volumes 1&2.  Helsinki: Finnish Literature Society (Suomalaisen Kirjallisuuden Seura), 2009, pg.  963; Aarno Laitinen et al., eds., Tamminiemi's Inheritance Dividers (Tamminiemen pesänjakajat).  Helsinki: Journalists Ltd. (Lehtimiehet Oy), 1981).

United States presidential election, 1912: The United States presidential election of 1912 was the 32nd quadrennial presidential election, held on Tuesday, November 5, 1912.  The election was a rare four-way contest.  Incumbent President William Howard Taft was renominated by the Republican Party with the support of its conservative wing.  After former President Theodore Roosevelt failed to receive the Republican nomination, he called his own convention and created the Progressive Party (nicknamed the “Bull Moose Party”).  It nominated Roosevelt and ran candidates for other offices in major states.  Democrat Woodrow Wilson was finally nominated on the 46th ballot of a contentious convention, thanks to the support of William Jennings Bryan, the three-time Democratic presidential candidate who still had a large and loyal following in 1912.  Meanwhile, the Socialist Party of America renominated its perennial standard-bearer, Eugene V. Debs.  It is the last election in which a former, or incumbent, President (Roosevelt) ran for the office without being nominated as either a Democrat or Republican.  It is also the last election in which an incumbent president running for re-election (Taft) failed to finish either first or second in the popular vote count.

Democratic Party presidential primaries, 1924: The 1924 Democratic presidential primaries were part of the selection process by which voters of the Democratic Party chose its nominee for President of the United States in the 1924 U.S. presidential election.  The concept of a primary election, where any registered party member would vote for a candidate, was relatively new in the American political landscape.  In only 12 states were actual primaries held, and even in those the results were not universally binding for the delegates to the Democratic National Convention, where the presidential candidate would be formally chosen.  In most of the country, the selection of delegates was confined to state-level conventions and caucuses, under the heavy hand of local political machines. Though William Gibbs McAdoo won a vast majority of states, and much more than half of the popular vote, in those twelve states that held primary elections, it meant little to his performance nationwide.  Many of the delegations from states that did "not" hold primary elections favored his main rivals, Oscar Underwood of Alabama and Al Smith of New York, neither of which won any primary elections.  As well, the primaries that McAdoo did not win were won by "local sons" who stood no chance of winning the nomination, or in some cases were not even formal candidates.  Once at the convention, the party was deadlocked for 102 straight ballots, before dark horse candidate John W. Davis, (who was not a formal candidate when he arrived at the convention) was chosen on the 103rd ballot.  Davis went on to lose the election to Republican candidate Calvin Coolidge.

Unpledged elector: In United States presidential elections, an unpledged elector is a person nominated to stand as an elector but who has not pledged to support any particular presidential or vice presidential candidate, and is free to vote for any candidate when elected a member of the Electoral College.  Presidential elections are indirect, with voters in each state choosing electors on Election Day in November, and these electors choosing the President of the United States and Vice President of the United States in December.  Electors today are elected in every state by popular vote, and in practice have since the 19th century almost always agreed in advance to vote for a particular candidate — that is, they are said to have been "pledged" to that candidate.  In the 20th century, however, several elections were contested by unpledged electors, who made no pledge to any candidate before the election.  These anomalies largely arose over fissures within the Democratic Party over the issues of civil rights and segregation.  No serious general election campaign has been mounted to elect unpledged electors in any state since 1964.

1896 Democratic National Convention: The 1896 Democratic National Convention, held at the Chicago Coliseum from July 7 to July 11, was the scene of William Jennings Bryan's nomination as the Democratic presidential candidate for the 1896 U.S. presidential election.

Supporting paragraphs: Khizr and Ghazala Khan 2016 Democratic National Convention
Answer: Hillary Clinton