Question: In what year was the politician who represented Nevada's new district, that was created as a result of the 2010 Census, from 2013-2015 born?

Context paragraphs:
Texas's 36th congressional district: Texas's 36th Congressional District is a new district that was created as a result of the 2010 Census.  The first candidates ran in the 2012 House elections for a seat in the 113th United States Congress.  Steve Stockman won the general election, and represented the new district.  On December 9, 2013, Stockman announced that he would not seek reelection in 2014, and would instead challenge incumbent John Cornyn in the Republican senatorial primary, and was succeeded in the U.S. House by Brian Babin.

Texas's 33rd congressional district: Texas's 33rd Congressional District is a new district that was created as a result of the 2010 Census.  The first candidates ran in the 2012 House elections, and were seated for the 113th United States Congress. `

Lanark—Frontenac—Lennox and Addington: Lanark—Frontenac—Lennox and Addington is a federal electoral district in Ontario, Canada which has been represented in the House of Commons of Canada since 2004.  It was scheduled to be abolished at the time of the 2015 general election; the Lanark County and Frontenac components of the riding will be redistributed into the new district of Lanark—Frontenac, while Lennox and Addington County will be redistributed into the new district of Hastings—Lennox and Addington.

Oregon's congressional districts: The U.S. state of Oregon has had five United States congressional districts since 1982, when the Fifth District was added.  Boundaries were redrawn following the population changes to each district as determined by the 1990, 2000, and 2010 Censuses.  Although early projections suggested that Oregon might gain a sixth congressional district as a result of the 2010 Census, the state's population was about 42,000 people short of gaining a new district.

Texas's 35th congressional district: Texas's 35th Congressional District is a new district that was created as a result of the 2010 Census.  The first candidates ran in the 2012 House elections, were seated for the 113th United States Congress.  This election was won by Lloyd Doggett, who previously represented Texas's 25th congressional district before redistricting.  The shape of the district has been described as one of the ten most gerrymandered in the US.

Arizona's 9th congressional district: Arizona's ninth congressional district is a new district that was created as a result of the 2010 Census.  The first candidates ran in the 2012 House elections, and the first representative was seated for the 113th Congress in 2013.

Nevada's 4th congressional district: Nevada's 4th Congressional District is a new district that was created as a result of the 2010 Census.  Located in the central portion of the state, it includes most of northern Clark County, southern Lyon County, and all of Esmeralda, Lincoln, Mineral, Nye, and White Pine counties.  Although the district appears rural, almost 90% of the district's population lives in Clark County.

Texas's 34th congressional district: Texas's 34th Congressional District is a district that was created as a result of the 2010 Census.  The first candidates ran in the 2012 House elections, and were seated for the 113th United States Congress.  Filemon Vela, Jr. won the general election, and was seated in the new district.

Steven Horsford: Steven Alexander Horsford (born April 29, 1973) is an American politician who was the United States Representative for Nevada's 4th congressional district from 2013 to 2015.  Horsford previously served in the Nevada Senate, representing Clark County's 4th Senate District from 2005 to 2012.  He also served as Nevada's first African-American state senate Majority Leader and was the first African American to represent Nevada in Congress.  He is a member of the Democratic Party.

Georgia's 13th congressional district: Georgia's 13th congressional district is a congressional district in the U.S. state of Georgia.  The district is currently represented by Democrat David Scott, though the district's boundaries have been redrawn following the 2010 census, which granted an additional congressional seat to Georgia.  The first election using the new district boundaries (listed below) were the 2012 congressional elections.

Supporting paragraphs: Steven Horsford Nevada's 4th congressional district
Answer: 1973