The 2018 Massachussett's 7th Congressional district Democratic primary, a general election in its effect this race saw Boston Councilwoman Ayana Pressley challenge 10 term Representative Mike Capuano in an ultimately successfull ethnicity Based/generational challenge
With local progressive support by the Likes of Councilwoman Michelle Wu, and even the support of Attorney General Maura Healey, Pressley was able to make the successfull argument that Capuano was an insufficient agent of change in spite of his existing seniority and self-styled Progressivism.
By contrast, Capuano enphasized his seniority in congress, multitude of relationships—national such as that of John Lewis, who campaigned for him, and local, such as Boston Mayor Marty Walsh.
However, Pressley's story—that she dropped out of college to care for her mother, before Working in Congress for Joe Kennedy II and John F. Kerry, her strident progressive positions, such as abolishing ICE and promoting significant congressional action to curb President Trump's power, ended up being the winning argument in this seat.
In terms of her coalition, Pressley did best with African American and Hispanic voters in Central Boston, followed by Asian voters in Southern Allston and Brookline.
By contrast, she was weakest with white voters throughout the district, and even lost African American voters in Randolph—indicating that while she was increadinly popular in Boston's minority Communities, who powered her to first place finishes in the At-Large Council Elections since 2009, that Capuano remained more popular in the Minority communities that were significantly less familiar with her than with Capuano.