Trump doomed?

Republican presidential hopeless Donald Trump seems to be able to shrug off and survive anything he says, regardless who he may offend.
He ridiculed John McCain for having been a long-time prisoner of war, he antagonized women, criminalized immigrants, and pee’d off GOP leadership, – only to see his poll numbers go up.
Even kissing up to Vladimir Putin helped him excite more followers.
Now he is faced with the ultimate test, – how to survive endorsement by his new cheer leader turned ring master, – Sarah Palin!