Republican State Representative Mark Costello easily won yesterday’s special election to represent Iowa Senate district 12. The seat became vacant after Joni Ernst’s victory in the U.S. Senate race. According to unofficial results posted on the Iowa Secretary of State’s website, Costello received 3,068 votes, to 924 votes for Democrat Steve Adams and 131 votes for Libertarian Don Brantz. Adams deserves credit for stepping up to give voters a choice in the second- or third-most Republican Iowa Senate district. Although the Libertarians were smart to nominate a candidate here, they didn’t have anything like the Iowa GOP’s resources for voter turnout, and their nominee got the worst kind of publicity a candidate can have when he was charged with several crimes earlier this month.

Democrats retain a 26 to 24 majority in the Iowa Senate, but Costello told Radio Iowa he’s optimistic and hopeful Republicans will win a majority after the 2016 elections. They certainly will have better opportunities to gain Iowa Senate seats in the coming cycle than they did in 2014. Blowing the chance to defeat GOP State Senator Mark Chelgren this year could prove costly for Iowa Democrats.

Costello’s victory will force a special election in Iowa House district 23, which he has represented for the last two years. Like Senate district 12, the House district should be safe for Republicans, allowing them to maintain a 57 to 43 majority in the Iowa House next year.

I expect another crowded GOP nominating convention when House district 23 delegates meet to choose a new candidate. Several people who sought the GOP nomination in Senate district 12 live in communities Costello has represented. Republicans would do well to nominate a woman. It’s embarrassing that Amy Sinclair is the only woman left in their Iowa Senate caucus, and the Iowa House GOP caucus includes 51 men (including Costello) to just six women.