Analysis of information sources in references of the Wikipedia article "Political positions of the Democratic Party (United States)" in English language version.
Suffice to say that there has not been a huge swing away from the center since the 1970s.
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: CS1 maint: multiple names: authors list (link)Source: Guardian/Vice/CCN/YouGov poll. Note: ±4% margin of error.
Source: Guardian/Vice/CCN/YouGov poll. Note: ±4% margin of error.