You're spot on about Sanders having very little dirt on him or bringing significant baggage. I suspect that the Trump team would have made a big play on Sanders claim of being a socialist even though outside of America he's more like a Lib Dem than what we would think of as a socialist. Sanders would probably have had less financial backing than Trump but that's not necessarily a bad thing and if his campaign in the Primaries was anything to go by, he would have had a grass roots campaign unlike any other.
I'm sure they would have. But the interesting thing about that is that it would have meant Trump saying something about the economy,
As I said in another thread, the truism about (American) elections is that it's all about the economy and yet the Democrats lost despite the economy doing reasonably well. But what's even more bizarre is that the winning candidate outlined virtually no economic policies - there was a sketchily drawn tax plan and plenty of rhetoric about free trade but virtually no detail at all. It goes against the grain on how elections are won and lost