Title: History of the Arizona Cardinals
Content:  Several QB options were floated for 2011, including veteran Donovan McNabb (a part-time resident of Chandler, a local suburb) and Carson Palmer (who Kurt Warner personally lobbies for). In the end, the Cardinals got Eagles backup QB Kevin Kolb in exchange for trading CB Dominique Rodgers-Cromartie. They beat Carolina in Week 1 for Kolb's first regular season game on the team, but lost the next three against Washington, Seattle, and New York despite close scores. In Week 5, they headed to Minnesota seeking their first win there since 1977. Week 8 saw the Cardinals returning from their bye week to play the 
Title: 2014 Arizona Cardinals season
Content:  Carson Palmer would suffer a season-ending injury on his left-knee. Drew Stanton would take over as quarterback for the rest of the game. Thanks to the efforts of the defense during the fourth quarter, the Cardinals rallied to beat the Rams 31-14.
Title: Lorenzo Alexander
Content:  On April 3, 2014, Arizona Cardinals’ head coach announced his decision to move Alexander from outside linebacker to inside linebacker to provide depth after the departure of Karlos Dansby. Head coach Bruce Arians named Alexander the backup inside linebacker, behind Larry Foote and Kevin Minter, to begin the regular season. In Week 13, he collected a season-high three solo tackles and made one sack during a 29-18 loss at the Atlanta Falcons. He finished the season with 13 combined tackles (11 solo) and one sack in 16 games and zero starts.
Title: History of the Arizona Cardinals
Content:  the comeback of running back David Johnson was nothing like it was hoped to be, as he was constantly shut down. Through two weeks, they had failed to put up a single offensive score. In week 3 they played the Chicago Bears, and after having a solid first quarter (that included two touchdown passes), the offense again got pummeled and Bradford only threw for 65 yards from that point on. Late in the fourth quarter however, Bradford was benched and replaced by rookie Josh Rosen, who was the Cardinals' first round pick in the 2018 NFL Draft. Rosen went 4/7 on his throws, had 36 passing yards, and threw an interception. Rosen remained as the starting QB and Bradford was released by the Cardinals 
Title: History of the Arizona Cardinals
Content:  23–20. Week 13 saw the return of Kevin Kolb as the starter against the Dallas Cowboys. After a slow first half for the Cardinals, the score at halftime was 10–0, Dallas lead. The Cardinals defense played well, holding the Cowboys to just 10 first half points. In the second half, the offense got going, and Kolb went on to throw for 247 yards. At the end of regulation, the Cowboys were on offense, and poor clock management led to a 49-yard field goal attempt for the win. Dallas head coach Jason Garrett called a time-out as the kicker was lining up 
Title: List of Arizona Cardinals head coaches
Content:  <references group='N' />
Title: 2008 Arizona Cardinals season
Content:  The Cardinals had a total of 5 players selected to the 2009 Pro Bowl. On offense, Kurt Warner was the starting quarterback, with Larry Fitzgerald and Anquan Boldin both at wide receiver. On defense, Adrian Wilson went as one of the conference's defensive backs. Sean Morey would be start on special teams.
Title: 2011 Arizona Cardinals season
Content:  The 2011 season was the Arizona Cardinals' 92nd in the National Football League, their 24th in Arizona and their fifth under head coach Ken Whisenhunt. This was going to be the Cardinals first season with new starting quarterback Kevin Kolb, but he was injured and replaced by John Skelton. The team improved on their 5–11 record from the 2010 season, but missed the playoffs for a second consecutive season. The 2011 Cardinals won four overtime games, an NFL record.
Title: List of Arizona Cardinals starting quarterbacks
Content:  The number of games they started during the season is listed in parentheses:
Title: 2015 Arizona Cardinals season
Content:  For the first time in 4 years, head coach Bruce Arians made his first return to Pittsburgh, where he served as wide receiver's coach from 2004 to 2006, as offensive coordinator from 2007 to 2011, and was part of the Steelers' Super Bowl winning teams from 2005 and 2008. The Steelers were led by backup quarterback Landry Jones in this game due to the absence of Ben Roethlisberger. Jones would have a really good game, throwing for 168 yards on only 12 throws. Carson Palmer would throw 2 interceptions while he threw the ball 45 times, completing only 29 passes in the process. With the loss, the Cardinals fell to 4-2. In this rematch of Super Bowl XLIII, this would turn out to be the Cardinals' only road loss of the season.

Question: who is the arizona cardinals backup quarterback?
Answer: John Skelton.