We need MORE JOBS! And to have more jobs, we need an environment conducive to economic growth - competition, low corporate taxes, less govt regulations and red tape, not having burdens like Obamacare, etc. If there are more companies starting up, succeeding, and growing, we will have more jobs. If we have more companies with more jobs for workers, companies (including Walmart) will have to pay workers more to attract and retain them. And even if Walmart itself grows to the point where it needs more workers and its workforce demand starts to outpace the workforce supply, they will have to pay more to lure new hires away from elsewhere.
If there are fewer jobs available and workforce supply exceeds workforce demand, employers can generally get away with paying workers no more than they have to. And when government gets its hands in there too much, businesses have to cut and eventually may end up leaving and going elsewhere.