If Snopes were left-leaning, it would have been impossible for me to defend Bush all those years.
Sorry, but Snopes is left-leaning. What you've run across are examples so flagrant, they had to admit them to false. For example, "Trump to Repurpose USS Enterprise Into Floating Hotel and Casino" or "Donald Trump Was Born in Pakistan" are obviously fake and Snopes will label it as such.
The best way to check any "fact-check" site is to find the same quote said by two people on different sides of the aisle. What I have found is that many times, the same claim will receive a higher rating from the left, as the site will find an excuse as to why it may be true. The right receives no such courtesy.