Ayanna Pressley is the looming bigfoot in next year’s U.S. Senate race, capable of booting out incumbent Ed Markey the same way she toppled longtime Rep. Michael Capuano in a Democratic primary challenge.

If she follows the same playbook she used on Somerville’s Capuano in 2018, Rep. Pressley will depict Markey as old and stale and herself as part of a wave of younger, fresher and more aggressive Democrats willing to take on President Donald Trump. Her campaign slogan then was “Change Can’t Wait.”

“This is a fight for the soul of our party, and the future of our democracy, at a time when our country is at a crossroads,” Pressley said on election night when she won Massachusetts’ 7th congressional district.

That exact same message could resonate with liberal Democratic primary voters nex

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