Here are the Super Tuesday results. 35% of the votes.Yes, you DID reference the primary specifically. I do think the media pushing Trump because they wanted the weaker candidate to win, did help Trump gain popularity, because that was the goal. And it worked. Trump won, not by convincing a majority of Republicans that he was the best nominee. He won because the field shrank successively as the Primary season progressed. And at the end of which, Trump got the nomination, and had to convince skeptics to give him a go in the general. That's not what majority support looks like when ~half your voters have to hold their noses.
And if those other candidates were in the race in all states on one day, I do think it's likely Trump would still have won. Not by anything close to a majority. Trump has a fiercely loyal and sizeable following. So Trump would get his votes, and the not-trump vote would be divy'd up amongst the rest. So even if the majority of voters would vote against Trump, the person they didn't want would still win.