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Biggest blow to Clinton came from Midwest Obama voters who backed Trump, says progressive strategist

The biggest blow to Hillary ClintonHillary Diane Rodham ClintonHillary and Chelsea Clinton to host series based on their book 'Gutsy Women' Democrats see spike in turnout among Asian American, Pacific Islander voters Biden officially announces ex-Obama official Brian Deese as top economic adviser MORE's 2016 campaign came from voters in the Midwest who previously backed former President Obama but switched over to President TrumpDonald John TrumpAppeals court OKs White House diverting military funding to border wall construction Pentagon: Tentative meeting between spy agencies, Biden transition set for early next week Conservative policy director calls Section 230 repeal an 'existential threat' for tech MORE, progressive strategist Ruy Teixeira said on Wednesday.

"Did she lose because people switched from Obama to Trump? Or did she lose because of a lack of enthusiasm for her candidacy, which resulted in people either not showing up or voting for a third party," Teixeira, author of the "Optimistic Leftist," told Hill.TV's Jamal Simmons on "What America's Thinking."

"This is a debate that has roiled the Democratic Party ever since Hillary Clinton lost the election," he said.

"My sense of the data, looking at a place like Iowa and these other states in the Midwest, is it was primarily a problem of switchers," Teixeira said, adding that "both were important."

Roughly 8.4 million voters who supported Obama in 2012 backed Trump four years later, according to the political website Sabato's Crystal Ball.

Trump in 2016 won historically Democratic stronghold states like Michigan, Wisconsin and Pennsylvania after making multiple trips to the states in an effort to appeal to working-class voters.

— Julia Manchester