Today the Senate will make history, swearing in a record-breaking 20 female senators -- four Republicans and 16 Democrats -- in office.

As the 113th Congress is sworn in today on Capitol Hill, ABC "World News" anchor Diane Sawyer has an exclusive joint interview with the historic class of female senators.

Diane Sawyer's complete interview will air on "World News" and "Nightline" tonight.

"I can't tell you the joy that I feel in my heart to look at these 20 gifted and talented women from two different parties, different zip codes to fill this room," Sen. Barbara Mikulksi, D-Md., said while surrounded by the group of women senators. "In all of American history only 16 women had served. Now there are 20 of us."

Senator-elect Deb Fischer, R-Neb., today becomes the first women to be elected as a senator in Nebraska.

"It was an historic election," Fischer said, "But what was really fun about it were the number of mothers and fathers who brought their daughters up to me during the campaign and said, "Can we get a picture? Can we get a picture?' Because people realize it and -- things do change, things do change."