Former Vice President Joe Biden’s hypothesis that most Democrats fall closer to the middle of the political spectrum is flawed, according to one researcher.

A majority of Democrats want the party to adopt more liberal, progressive policies and candidates than more moderate, centrist ones, Lord Michael Ashcroft, a polling expert, former deputy chairman of the United Kingdom’s Tory Party, and a conservative donor, wrote in his book Half-Time: American Public Opinion Midway Through Trump’s (First?) Term.