1. Don't get me wrong, I'm as scared of any candidate as far to the right of the US centre as Sanders is to the left. But traditional Republicans in the US are as close to the US centre as traditional Democrats are - Sanders is an outlier (as are Trump and his ilk).
2. Again, it seems to be a sliding scale. It fits the (caveats applied) common sense test too. I'd give my life for my family, my fortune for my friends, etc. on a sliding scale down to people I've never met on the other side of the world. All lives should be equal but most (if not all) can't help but care more about those closer to home.
3. I think everyone should have access to at least a minimum level of healthcare, but I am a very firm believer in getting what you pay for. I pay a huge amount to the NHS every month and get a very shoddy service in return. Without a threat of going bust, I cannot see how any organisation can properly drive down costs - there's simply no incentive other than sitting across a table from a bunch of MPs who also make a living out of spending our money.
4. There certainly is too much money in politics, there's no doubt about that. I'd happily see that reduced, but other than being a proponent of that, I don't think any of the economic measures Sanders supports have merit.
All of that said, I agree with Sanders on pretty much all of his non-economic policies - although his "foreign policy" (AKA just do nothing) leaves a lot to be desired. Not sure what it is with Americans and the mentally deficient running for president though - have you seen his opinions on cervical cancer? Not quite Trump in his idiocy but he wouldn't get near the electorate over here.