Shouldn't you vote for the party that's best for the less-well off, and not the one that most redistributive? (OK, if you are eg in the US, there's not that much choice in the first place.)
I live in the UK, which like the US has serious problems with income gaps and class mobility. When I say redistributive, I should clarify that I don't just mean 'here poor person, have some money', but more that I would aim towards a more Scandinavian-style economy, where more money/effort is spent on social programs.