An Arizona special election primary Tuesday to replace the late Rep. Raúl Grijalva is the latest flare-up of the Democratic Party’s clashes over age and experience.

The late Rep. Raúl Grijalva, who is Adelita Grijalva's father, was one of the most senior and progressive power brokers on Capitol Hill.

Tensions within the Democratic Party over age, representation and experience have roiled a special election primary in southwest Arizona, where a young, social media-savvy activist is taking on the daughter of Rep.