To be fair, pretty much any WWE superstar could run for President tomorrow and he'd win.
You could get Papa Shango, Hacksaw Jim Duggan, Tatanka, Rowdy Roddy Piper (RIP) or Million Dollar Man Ted DiBiasie to run for US President and they'd win over Donald Trump. It's also worth pointing out that this poll - conducted by Public Policy Polling - was likely carried out well before revelations came to light regarding Donald Trump's memo to FBI DIrector James Comey about General Mike Flynn's ties to Russian intelligence.
Not only that, it's very probable that this poll was carried out before Trump fired Comey in attempt to derail the investigation into his own ties to Russian intelligence - OR when Trump revealed highly classified intelligence to the Russian ambassador and foreign minister in the Oval Office, after he kicked out all US press and only allowed in Russian, state-owned photographers.
Anyway, PPP's poll suggests that Johnson - were he to run as a Democrat - would comfortably beat Donald Trump by 42/37, with favorable ratings for Johnson of 36%. While this might be good news for Johnson, it's worth pointing out that he's a registered Republican and would be unlikely to stand as a Democrat. However, PPP's poll also suggests that a majority of Americans - 48% - are now in favour of impeaching Donald Trump.
Either way, it's kind of incredible that we're seriously talking about a professional wrestler-turned-actor as a better candidate to be leader of the free world - in the hopes he'll replace the fat f*ck who's currently in charge now.