I don't agree with President Obama on everything, and in general, I think he's been very unhelpful when it comes to the problem of income inequality. One thing I do agree with him on is this: Anyone who is willing to work a 40 hour day in the United States should not live in poverty.
That's a very nice thing to say, and I'm sure it gives you a buzz to say it, but it doesn't reflect life on this planet.
We have markets so we don't have to deal with futile, unrealistic mandates from moral busy-bodies. The market says that unskilled labor in the United States is not valuable relative to the productivity of salaried workers. Government mandate will not change the underlying economics.
So we are confronted with a choice. Use the government to close the gap between ethical wages and market wages or we can complain about corporations and capitalism, while making futile attempts to command the economy. Democrats have only complained and commanded, with a brief respite to establish a vote-buying scheme (welfare), and that's why the lower classes suffer unnecessarily.