In 2018, the US Senate has 23 women serving in the body, including 17 Democrats and 6 Republicans.
11 of the 17 Democratic women face reelection challenges in November.
These include the following:
Dianne Feinstein of California
Mazie Hirono of Hawaii
Elizabeth Warren of Massachusetts
Debbie Stabenow of Michigan
Amy Klobuchar of Minnesota
Tina Smith of Minnesota
Claire McCaskill of Missouri
Kirsten Gillibrand of New York
Heidi Heitkamp of North Dakota
Maria Cantwell of Washington State
Tammy Baldwin of Wisconsin
Additionally, two women are running for election to the Senate:
Kyrsten Sinema of Arizona
Jacky Rosen of Nevada
Also, Jenny Wilson is the Democratic nominee in Utah, competing against former 2012 Republican Presidential nominee Mitt Romney for the seat of retiring Orrin Hatch, but seen as having no real chance to overcome the well known Romney, much admired in Mormon dominated Utah.
At this point, six weeks before the midterm elections, all of the seated Democratic women Senators seem likely to be reelected, with the most contentious challenges being Claire McCaskill in Missouri and Heidi Heitkamp in North Dakota.
The odds on the two women running for election in Arizona and Nevada also look good at this point.
So the odds are heavy that there will be 25 women in the Senate in 2019, with 19 being Democrats and 6 Republicans.
And in the cases of Wisconsin and Arizona, the Republican challengers are women, so already we can add Arizona as a state which will have its first woman Senator. Additionally, Nebraska’s Republican woman Senator, Deb Fischer, has a Democratic opponent who is female, so that assures that seat will continue to have a woman as well.