If people voted by issue, it would look extremely different. Third party candidates would make up a good percentage of politicians. Most people fall in the middle. Conservative and liberal power would be diminished. @heelmanwilm would be your representative, not Bernie Sanders.
Quite a lot of polling data showed that a huge percentage of Americans supported Bernie's platform. If people voted on issues instead of partisan bias, he would be even more popular. The truth is that Bernie's platform is actually fairly moderate in the grand scheme of world politics. Single payer healthcare and tuition free public universities are not radical left wing policies.