What conservative candidates? Other than Cruz they are all rinos.
Trump and Cruz are the only two with conservative platforms and Trump is going all the way, though the tough part is getting the nomination in the end with the GOP leaders running the show. He or Cruz will need overwhelming support to get nomination.
Cruz needs to find a much larger base of support to win nomination. Trump has that and will get more as the rinos start dropping. All the single digit rinos will be gone before long. It will be Bush, Trump and hopefully Cruz.
Trump will slaughter Hilliary if gets the nomination.