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RED OAK, IA - NOVEMBER 04: Republican U.S. Senate candidate Joni Ernst speaks to members of the news media after casting her ballot on election day outside her hometown fire department November 4, 2014 in Red Oak, Iowa. According to the polls, Ernst is in a neck-and-neck race with her opponent, Democratic candidate Rep. Bruce Braley (D-IA), and the election in Iowa could decide which party controls the U.S. Senate. (Photo by Chip Somodevilla/Getty Images)
RED OAK, IA - NOVEMBER 04: Republican U.S. Senate candidate Joni Ernst speaks to members of the news media after casting her ballot on election day outside her hometown fire department November 4, 2014 in Red Oak, Iowa. According to the polls, Ernst is in a neck-and-neck race with her opponent, Democratic candidate Rep. Bruce Braley (D-IA), and the election in Iowa could decide which party controls the U.S. Senate. (Photo by Chip Somodevilla/Getty Images)

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Iowa Sen. Joni Ernst is set to deliver the Republican response to President Obama's State of the Union address Tuesday night. But who is this first-term senator? Dana Bash explains.

Who is Joni Ernst?

Iowa Sen. Joni Ernst is set to deliver the Republican response to President Obama's State of the Union address Tuesday night. But who is this first-term senator? Dana Bash explains.