Sanders has no business saying he will hire more teachers for public schools. Sanders can't hire more K-12 teachers; states or municipalities hire more public school teachers, and local authorities or school systems solicit and/or approve them. I can't say that there is even a major issue in the matter because I couldn't quote anything from Sanders that is related to this sociopolitical area. The real area of conflict is over the more than decade of primary education evolution that has occurred here in the US that is over the privatization of schooling. Not parochial or ethnic schools or prep schools, but rather charter schools,the for profit money and wealth generating machines that are rotting the US educational systems. That is what he should dwell upon.
Oh, by the bye. HRC is a self-promoting, amoral, uncompassionate, "tell the fools anything they want to hear", faux feminist, greedy, social climbing, politico and user dilettante who could be responsible for the ultimate demise of most organisms on planet Earth while she goes about gratifying her own super-ego.
Sanders offers enough for me. If he is nominated, he will certainly win the POTUS pos. If he addresses the rot that is US education, that will be enough for me.