Trumpled (Alternative Leading)

[Lods]

How could that happen to a conservative politician?

Probably because he's not a conservative.
He's a populist flip flop who's detested by a large number of conservatives.

The Republican party now has to make a judgement.
They're heading for oblivion whichever way it goes but do they take a risk and try and block him...with all the associated drama and chaos that will entail.
A continued falling in the polls may make that move more likely.
It may be too late already which is why so  many prominent Republicans are ensuring there is plenty of distance between them and Trump.