McCaskill, who earlier this week tweeted that it was "gonna be fun walking on the floor of the Senate" after winning a tough race in Missouri, seemed to appreciate the coincidence of a women-only "power meeting" happening in the Senate bathroom.
"Gonna need a bigger bathroom," she tweeted.
Sen. Amy Klobuchar (D-Minn.) later experienced a similar "traffic jam" in the women's restroom.
New senators here. W/ 20 women we had our first-ever in U.S. history traffic jam in women senators' restroom. #somerecordsmustbebroken— Amy Klobuchar (@amyklobuchar) November 14, 2012
The percentage of women in the Senate is now 20 percent, counting the women elected last Tuesday — an historic high.
Updated at 4:01 p.m.