Sen. Kamala Harris is increasingly pitching herself as the presidential candidate who can bridge the growing divide within the Democratic Party by focusing more on kitchen-table issues than ideological labels.

Competing against fellow top-tier Democrats like Sen. Elizabeth Warren, whose campaign slogan is “big structural change,” and Sen. Bernie Sanders who has been promising a “political revolution,” Ms. Harris has in recent appearances tried to distinguish herself by laying out a vision that is still liberal, but less far-reaching than those of the two prominent progressives.

She has also sought to be more aggressive on issues like health-care reform and climate change than former Vice President Joe Biden, the front-runner in the primary contest who has accused Ms. Harris of lacking clear positions.

The California Democrat is pushing her “3 a.m. agenda,” which she has described in interviews and town halls as “stuff that people are dealing with every day” instead of ideas that are going to “transform and upend.” She will be promoting it during a five-day bus tour across Iowa this week, following last week’s presidential debates that showcased the ideological split within the party—one that President Trump is hoping to use to his advantage.

The agenda, which she also touts in a new, six-figure TV and digital ad in Iowa, includes a middle-class tax cut, equal pay and a refundable tax credit to help with rising costs of housing. Harris is the first top-tier presidential candidate to air an ad in Iowa, six months before the caucuses.