way we began it, focusing on the record number of women in both parties running for office this year. tonight we'll take a look at california congressional district 25 where 31-year-old first-time candidate katie hill is running against republican incumbent congressman steve knight. kyung lah is outfront. >> look it up. if you don't look at us, we're coming. that's just the reality of it. >> reporter: democrat katie hill, age 31, a first-time candidate propelling a millenial-led challenge against a male incumbent 20 years older. >> you've seen what congress looks like. >> yeah. >> you don't look like most people in congress. >> right. we've got to change the face of politics if we want to really get people engaged around -- around politics and mobilize people to effect social change. >> reporter: that's why her campaign for california's 25th congressional district looks like this.