What you say about Trump sucking up the attention so that more reasonable republican candidates can't get any attention, I think is true also of Hillary and Bernie Sanders. Bernie sanders is not in any sense electable, but he drowns out any real opposition to Hillary.
That would be true if Sanders were not experiencing a near media blackout, at least until recently. I heard a BBC story a couple weeks ago that mentioned the Dem race and how there was "no serious opposition" to Clinton, and DID NOT MENTION SANDERS AT ALL. I was dumbfounded. Now finally the mainstream media are apparently catching up. Also, Sanders is the liberal front-runner and, I'm going out on a limb here, the likely nominee. (OK, yes, I am a Bernie fan.) He has the momentum and I think he can pull it off. Then again, just last week I found out that Webb is also in the race. What? How did I not know this? You can say Bernie has sucked all the oxygen out of the room, but I would again say Trump is the main media darling/punching bag. He is stealing "new cycles" (like CPU cycles only newsier) from all the other candidates across the board, on both sides of the aisle. He gets coverage because he is off the hook and an epic asshole. It's like the supermarket store shelves can only carry so many brands, and most of the shelf space is Trump Trump Trump.
Also, I disagree that Bernie is not electable. Case in point, today's political upheavals in Australia and the UK. Of course, the US is a completely different political animal. Simply put, the US electorate is mostly stupid, reacting to tabloid politics and little else. That's why we are where we are. Then again, who thought Obama was electable?
Anyway, must be time for coffee..