I don't trust Donald Trump, it's as simple as that for me. His unprincipled stances of the past in conjunction with his support of Democrats and liberal policies does not wash with the conservative he's trying to make himself out to be.
My gut tells me that at best, he's an egomaniac who is doing this for his own aggrandizement, and who will betray conservatives should he win the Presidency. At worst, he's a stalking horse for Obama or even Hillary Clinton should she primary Obama, who will either capture the GOP nomination and lose, or who will run against the GOP nominee as an independent.
I may be wrong. Trump may be everything he's now saying he is. But I don't think I'm wrong.
And I'll repeat my greatest fear regarding a potential GOP nomination of Donald Trump. What happens now that he's placed so much emphasis on the Birth Certificate issue, when Obama trots out the Long Form certificate a couple weeks before the election? Donald Trump is gambling that there is no certificate. That may be a gamble upon which he's willing to stake a presidential run, but it is not a gamble upon which the GOP can trust a nominee.