Buttigieg takes dig at Sanders working 'for years' in Washington

Former South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegBiden hopes to pick VP by Aug. 1 It's as if a Trump operative infiltrated the Democratic primary process Here's how Biden can win over the minority vote and the Rust Belt MORE took an apparent dig at Sen. Bernie SandersBernie SandersBiden will help close out Texas Democrats' virtual convention: report Senate Dems press DOJ over coronavirus safety precautions in juvenile detention centers Gabbard drops defamation lawsuit against Clinton MORE (I-Vt.) in a fundraising email, implying his 2020 rival is a Washington insider.

The email also appeared to take a dig at his fellow billionaire rivals Michael BloombergMichael BloombergIt's as if a Trump operative infiltrated the Democratic primary process Liberals embrace super PACs they once shunned .7 billion expected to be spent in 2020 campaign despite coronavirus: report MORE and Tom SteyerTom SteyerBloomberg wages war on COVID-19, but will he abandon his war on coal? Overnight Energy: 600K clean energy jobs lost during pandemic, report finds | Democrats target diseases spread by wildlife | Energy Dept. to buy 1M barrels of oil Ocasio-Cortez, Schiff team up to boost youth voter turnout MORE as "people who can spend millions of their own dollars on a campaign," though Buttigieg did not name them.

"Some of our competitors, like Bernie Sanders, have even run for president before -- and that means that they had a head start on things like building their fundraising lists," the email reads. "Having several million people on your email list allows you to do things like raise $4 million in two days -- something Bernie says he did in the 48 hours after the last debate."

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"If we are going to turn the page on our politics, we have to be able to compete with the people who have been working in Washington for years, and the people who can spend millions of their own dollars on a campaign. That means we need your help right now with another donation to this campaign," it continues. 

Buttigieg has previously aimed his fire on Sanders's progressive counterpart, Sen. Elizabeth WarrenElizabeth WarrenLongtime Democratic pollster: Warren 'obvious solution' for Biden's VP pick The Hill's Morning Report - Presented by Facebook - US virus deaths exceed 100,000; Pelosi pulls FISA bill Warren's VP bid faces obstacle: Her state's Republican governor MORE (D-Mass.), clashing with her in the two previous primary debates. 

The 37-year-old former mayor has run as an outsider to Washington, D.C., and has advocated a more moderate platform than Sanders or Warren.

Although Sanders was first elected to Congress in 1990, he has often been viewed as a Washington outsider for the majority of his career, supporting a number of progressive issues like "Medicare for All." 

Sanders most recently went against the mold on Thursday, when he joined nine other senators in voting against the U.S.-Mexico-Canada Agreement. 

The Vermont senator has also pushed back against the Democratic Party establishment and took the political world by surprise in 2016 in his unexpectedly strong challenge to Democratic-establishment favorite, Hillary ClintonHillary Diane Rodham ClintonLongtime Democratic pollster: Warren 'obvious solution' for Biden's VP pick How Obama just endorsed Trump Gabbard drops defamation lawsuit against Clinton MORE

The Hill has reached out to the Sanders campaign for comment.