As it relates to this most recent election: the appointment of Supreme Court judges by Trump led to the overturn of Roe v Wade.

The people in the pro-choice camp felt this was a great misfortune.

When Harris began her campaign, her campaign strongly ran on the platform to reverse the decision. (Not realistic if you ask me, presidents don’t have that power. But it was the major battle cry for the Harris campaign)

You ask almost any person voting for Harris ( at least this way my experience), and the first thing they would mention was abortion rights.

So, to many, this election was the choice between a pro-choice candidate, or a candidate who denied woman’s bodily rights.

Tl;dr The Harris campaign made it the focal point of the campaign given recent events in the Supreme Court. At least, that way my interpretation of things.