Which is the least liberal Democratic U.S. state?

[MT Treasurer]

I think a strong case can be made for Maine (in the sense that the less 'ideological' & more conservative-leaning parts of the state combined could - in theory, at least - outvote the reliably liberal towns), which makes it all the more surprising that only one other poster mentioned that state in their answer.

The state's 'reluctance' to send liberal Democrats to Congress and the fact that it’s the only 'blue' state where GOP prospects even at the federal level haven’t yet fallen victim to partisanship makes it even more of a compelling option.