Question: In First Daughter, Samantha McKenzie develops a relationship with a character played by an actor known for what role in "Buffy the Vampire Slayer"?

Context paragraphs:
Drusilla (Buffy the Vampire Slayer): Drusilla, or Dru, is a fictional character created by Joss Whedon and David Greenwalt for the American television series, "Buffy the Vampire Slayer" and "Angel".  The character is portrayed by American actress Juliet Landau.  Drusilla is introduced alongside her lover Spike (James Marsters) in the second season of "Buffy the Vampire Slayer" to serve as new antagonists to the series' heroine, vampire Slayer Buffy Summers (Sarah Michelle Gellar) and alongside Darla (Julie Benz) and Wolfram & Hart as the main antagonist of the second season of Angel.  In contrast to the series' previous central villain, the ancient and ceremonious Master (Mark Metcalf), Spike and Dru were introduced as a more unconventional but equally dangerous pair of vampires.

List of minor Buffy the Vampire Slayer characters: Buffy the Vampire Slayer is an American franchise which spans several media and genres.  It began in 1992 with the film "Buffy the Vampire Slayer", written by Joss Whedon and directed by Fran Rubel Kuzui, and was resurrected as the television series, "Buffy the Vampire Slayer" in 1997.  The show's popularity caused it to spawn a multitude of Expanded Universe tie-in material such as comic books, novels, and video games, as well as a spin-off program entitled "Angel".  In 2007, four years after the television series' seventh and final season, "Buffy the Vampire Slayer" was officially continued in the comic book "Season Eight".  The following is a list of minor recurring characters who appear in the franchise.

First Daughter (2004 film): First Daughter is a 2004 American romantic comedy released by 20th Century Fox.  It stars Katie Holmes as Samantha MacKenzie, daughter of the President of the United States, who enrolls at a college and develops a relationship with another student at the college played by Marc Blucas.  The film follows Samantha as she is given a new sense of freedom during her time away from the White House, and the advantages and disadvantages of her college life and education.  It co-stars Michael Keaton as the President of the United States and Amerie Rogers as Samantha's roommate, Mia Thompson.

List of Angel characters: This article lists the major and recurring fictional characters created by Joss Whedon and the writers of Mutant Enemy for the cult hit television program, "Angel".  For a more in-depth look at some of the minor characters on the show, please see the list of minor "Angel" characters.  For the characters of "Angel"'s parent show "Buffy the Vampire Slayer", please see list of "Buffy the Vampire Slayer" characters and list of minor "Buffy the Vampire Slayer" characters.

Buffy Summers: Buffy Anne Summers is the titular character from the "Buffy the Vampire Slayer" franchise.  She first appeared in the 1992 film "Buffy the Vampire Slayer" before going on to appear in the television series and subsequent comic book of the same name.  The character has also appeared in the spin-off series "Angel", as well as numerous non-canon expanded universe material, such as novels, comics, and video games.  Buffy was portrayed by Kristy Swanson in the film, and later by Sarah Michelle Gellar in the television series.  Giselle Loren has lent her voice to the character in both the "Buffy" video games and an unproduced animated series, while Kelly Albanese lent her voice to the character in the "Buffy the Vampire Slayer Season Eight" motion comics.

Willow &amp; Tara: Buffy the Vampire Slayer: Willow & Tara is a trade paperback anthology collection published by Dark Horse Comics in 2002 and based on the television series "Buffy the Vampire Slayer".  The volume collects three issues focusing on Willow Rosenberg and Tara Maclay: "Buffy the Vampire Slayer: Willow & Tara - Wannablessedbe", originally published in 2001 as a one issue special, and "Buffy the Vampire Slayer: Willow & Tara - Wilderness", originally published in 2002 as a two issue limited series.  It also adds a story from an "extra" issue.

Marc Blucas: Marcus Paul "Marc" Blucas (born January 11, 1972) is an American actor, known for playing Riley Finn in "Buffy the Vampire Slayer", Matthew Donnelly in "Necessary Roughness" and recently, abolitionist John Hawkes in "Underground".  Prior to his acting career, he was known for playing college basketball with the Wake Forest Demon Deacons.

Buffy the Vampire Slayer: Chaos Bleeds: Buffy the Vampire Slayer: Chaos Bleeds is a 2003 video game and the fourth of the "Buffy the Vampire Slayer" franchise, and the only multiplatform game.  It was the first to allow players to control characters other than Buffy Summers and feature a fully developed multiplayer mode; additional players had a limited ability to interact in a hidden debugging mode in the previous game, "Buffy the Vampire Slayer".

Angel (Buffy the Vampire Slayer): Angel is a fictional character created by Joss Whedon and David Greenwalt for the American television programs "Buffy the Vampire Slayer" and its spin-off series "Angel".  The character is portrayed by actor David Boreanaz.  As introduced in "Buffy" in 1997, Angel is a love interest for heroine Buffy Summers (Sarah Michelle Gellar), a young woman whose destiny as "the Slayer" is to fight the forces of evil, such as vampires and demons.  However, their relationship is complicated by the fact that Angel is himself a vampire cursed with remorse and a human soul, which motivates him to assist Buffy in her duties as Slayer.  The character's popularity led to the production of the spin-off "Angel", which follows the character's struggle towards redemption after moving to Los Angeles.  In addition to the two television series, the character appears in the comic book continuations of both series, as well as much other expanded universe literature.  Angel appears in the most television episodes of all the characters of both "Buffy the Vampire Slayer" and "Angel", appearing in 167 episodes (57 in "Buffy" and all 110 in "Angel").

Faith (Buffy the Vampire Slayer): Faith is a fictional character created by Joss Whedon for the television series "Buffy the Vampire Slayer".  Played by actress Eliza Dushku, Faith was introduced in the third season of "Buffy" and was a focus of that season's overarching plot.  She returned for shorter story arcs on "Buffy" and its spin-off, "Angel".  The character's story is continued in the comic book series "Buffy the Vampire Slayer Season Eight", and she also appears in apocryphal material such as other comic books and novels.  Faith was set to receive her own spin-off television series after the final season of "Buffy", but Eliza Dushku declined the offer, and the series was never made.  The character later co-stars in the 25-issue comic book "Angel & Faith" beginning in August 2011 under the banner of "Buffy the Vampire Slayer Season Nine", the story taking place mostly in London and the surrounding area.  Seven years after the character's creation, Whedon granted her the surname Lehane for a role-playing game and subsequent material.  The last issue of "Season Eight" was the first source officially confirmed to be canon that referred to Faith by her full name.

Supporting paragraphs: First Daughter (2004 film) Marc Blucas
Answer: Riley Finn