The potential exists to add seven Democratic women to the US Senate, and replace one Democratic woman with another Democratic woman this November.
Senator Barbara Boxer of California is retiring, and Kamala Harris is running to replace her, although her opponent, also a Democrat, is Congresswoman Loretta Sanchez. So no matter what happens, a Democratic woman in the Senate from California is being replaced by a woman from the Democratic Party.
Maggie Hassan, Governor of New Hampshire, is trying to defeat another woman, Republican Kelly Ayotte, for her Senate seat, and has a good chance of winning
Also, Catherine Cortez Masto of Nevada is running to replace Senate Minority Leader Harry Reid, but is in a tough race, that may be the only Democratic seat in danger, against Republican nominee Joe Heck.
Tammy Duckworth is running for the Illinois Senate seat held by Republican Mark Kirk, and is favored to win.
Katie McGinty is running in Pennsylvania against Republican Pat Toomey, a race seen as very close.
Deborah Ross is running in North Carolina against Republican Richard Burr, another close race.
Ann Kirkpatrick is in a very competitive race in Arizona against well known Republican Senator John McCain.
Finally, Patty Judge is running in Iowa to replace Senate Judiciary Committee Chairman Chuck Grassley, a tough fight.
There are 20 women in the US Senate now, 14 Democrats and 6 Republicans. One woman, Barbara Mikulski of Maryland, will be replaced by a man, Chris Van Hollen. And Kelly Ayotte could be the one Republican woman who leaves the Senate if she loses to Maggie Hassan.
So the end result could be 5 Republican women and a grand total of 20 Democrats if all the women listed above were to win.
That is certainly unlikely to happen, but if it did, we would have the highest number of women Senators in any Congress in American history—25!