I agree that it's better to ask about specific values than political parties. Because people may have the same values but chose different ways to get there.

For example, both want to genuinely help poor people. But one thinks it's better to help them socially, other person thinks it's better to create more jobs. But it doesn't make one good and one bad. Maybe it's more influenced by their experience or maybe they don't have the same amount of information. Maybe if one person had more info, they would change their political opinion while their values would still be same.

For example nowadays, traditional left is becoming increasingly against free speech. In the past they advocated for minorities etc and tried to ensure their voices are heard. Today this has gone into extreme in some countries and some situations and basically it is becoming the majority that is prevented from free speech for the sake of minority.

So for example a person whose value is freedom could have been a leftist in the past but due to circumstances decided to vote for the right wing party because things have changed.

So it may be better to ask about values and not parties. You never know why the person votes a certain way.