I'm surprised he lasted this long. No substance, but the passionate. He's still strongly in second place, and I don't think the Trump run is over. He has a lot of true believers
I like the guy, especially his honesty. I do not think he would be a good president. He has said some questionable things and his foreign policy seems a bit naive. I also haven't seen the details of his tax plan or how it would work.
I like governers much more than senators, but I like Rubio. I think he is the best candidate right now.
Also, in regards to your statement about Clinton, the polls I've seen show Carson (+10), Rubio (+5), Cruz (+3), Christie (+5) all beating Clinton. Clinton is only shown beating Trump, with the poll even showing Sanders beating Trump. http://www.realclearpolitics.com/epolls/latest_polls/pres_general/