This is why so many Republicans are ready to buck public opinion on health care

TL;DR: Republican voters want "trustee-style" representatives, Democratic voters want "delegate style" representatives. Republican representatives aren't hurt much electorally when they vote against the wishes of their constituents if doing so is consistent with the representatives' stated principles, whereas Democrats get punished by the voters for going against their wishes.

Note that the submission is not about health care, or really any current political issue. That was just the issue they are using to illustrate this underlying difference in how Republicans and Democrats view their representatives.