evidence: This is a complicated assertion to evaluate, because the nature of liberalism changes over time, making candidate-to-candidate comparisons difficult. If you compare Biden’s platform to an absolute concept of liberalism, it is the most progressive. Tracking shifts within his party, Biden has moved to the left compared with where Obama and some previous Democratic nominees stood. In his own time, though, Biden is hardly in his party’s ideological vanguard, at least compared with previous nominees such as George McGovern.