On February 25, 2017, voters in the 10th district of the Delaware Senate voted in a special election to fill the seat left vacant by Democrat Bethany Hall-Long, the previous incumbent, who had resigned at the beginning of the year after having been elected lieutenant governor the preceding November. Democrat Stephanie Hansen, an environmental lawyer from Middletown who had in the past served a term as New Castle County Council President, won with 58.1 percent of the vote, defeating Republican opponent John Marino, who finished with 40.8 percent. Libertarian John Lanzendorfer, the only other candidate in the race, claimed the other 1.1 percent.