Trump is the better communicator and more exciting guy. Usually I would say that Pence is too conservative to have a serious chance, but I wouldn't underestimate him.
It probably also depends on the circumstances he becomes president. If Trump dies, it would be easier for Pence. If he gets impeached (more likely), it would be far more difficult.
This.
I do think Pence conveys a rare sincerity that few politicians manage to scrounge up. He's as conservative as Ted Cruz, but no one views him as smarmy, as they do with Cruz. I do think he has the ability to win over moderates, and even a few liberals, based on his sincere persona, under certain circumstances.
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