One factor: At least a couple of major investment banks, along with many other commentators, see Musk's apparently good relationship with President Trump as a reason to invest in Tesla. Of course, nobody can say how much it affects their market capitalization, but just the banks saying it will be self-fulfilling to an (unknown) extent.

Musk wouldn't be the first to use lobbying to help his business, and so far (a small sample) Trump has used his power much more than past presidents to help and punish businesses he favors/disfavors (e.g., threatening businesses that want to relocate factories, threatening airplane manufacturers, tweeting favorable and unfavorable things about businesses, etc.). Trump has a reputation for corruption, that's factual; that doesn't tell us how true it is or how it applies in this kind of situation or in this particular case. What I'm trying to say is, let's be careful with the facts.

If you search for 'musk trump', you can find plenty of discussion of it. Here's one article from a good source:

https://www.nytimes.com/2017/01/26/business/elon-musk-donald...