Self Labelled 'leftist' Catholics are really just Disobedient Catholics who want to ignore the Church's teachings they disagree with, and usually are more aligned with their political party or group than they are with the Church on any given issue.   The same can also be said of Self Labelled 'Right Wing' Catholics.      The Church will side with those organizations policies promoting the most important good's and opposing the most vile evils of the day.   I must say that the Democratic party in general, if you take all the issues, is the party pushing the most vile and immoral policies today.   I am not party affiliated.  Though the Republican party is not inline with the Church on many issues, these issues tend to be of lower moral gravity than the issues with which the Democratic party platform is contrary to the Church's teachings.    If you disagree, line up the issues where the RNC Platform is at odds with the Church, and those where the DNC is at odds and compare.