What the marchers had in common was that they were (mainly) women, but their concerns go far deeper than that shared double X chromosome. They were concerned about his attitude to "others" who do not share his white, male, nominally Christian superiority, who are sick or disabled, not affluent enough to pay US healthcare costs, unemployed for no fault of their own in an era of global unemployment, or who live in fear of retribution if they blow the whistle on the sharp practices of their employers.
Then there are those who live in countries where all those disadvantages are nothing compared to what they are suffering, who are prepared to go to America, the Land of the Free, to work for peanuts and be treated as dirt rather than stay at home under a dictator or a police state.
Engraved on a bronze plaque and mounted inside the pedestal of the statue of Liberty is this by Emma Lazarus:-
Not like the brazen giant of Greek fame,
With conquering limbs astride from land to land;
Here at our sea-washed, sunset gates shall stand
A mighty woman with a torch, whose flame
Is the imprisoned lightning, and her name
Mother of Exiles. From her beacon-hand
Glows world-wide welcome; her mild eyes command
The air-bridged harbor that twin cities frame.
"Keep, ancient lands, your storied pomp!" cries she
With silent lips. "Give me your tired, your poor,
Your huddled masses yearning to breathe free,
The wretched refuse of your teeming shore.
Send these, the homeless, tempest-tost to me,
I lift my lamp beside the golden door!"
I think that " mighty woman with a torch" would have been at the head of the march.