What are some of the issues we still face today that were similar to what the Populist Party's monetary and economic platform was in the 1800's?
This is an answer that will definitely change based upon who you ask. I think it's safe to say that we're absolutely in a similar situation though and I applaud the connection made here.
If you're asking for further research opportunities, I suggest you take a look at:
- the rights of women
- rights of unions/general assemblies
- how big business (trusts/monopolies) operate
- rich vs. poor
The last two points are key-- during the late 1800s/early 1900s Roosevelet and (more notably) Taft really began breaking up trusts (Sherman Anti-Trust Act, etc) that would damage big business. People were not allowed to accumulate money so dishonestly. Now we see the same argument magnified: are corporations people?
The final point I suggested is the rich vs. poor: you see a huge gap in wealth during the Gilded Age, just like you see the angry 99%s now.