As usual, the truth is somewhere in the middle.
Yes, Snopes has and often does lean left.
However, one of their advantages is they offer citations to everything they post so while you don't have to (and shouldn't) blindly take their word for it, they are a good place to go in order to at least check the research and follow their citations to look at the evidence.
There have been cases where they have been very correct when some on the right screamed they were 'fake', and there have been times when they have been very wrong when liberals used them as a source.
They really got under the Right's skin when they called out a lot of the fake Obama birth certificates, student IDs and stuff that were going around as trolling games by 4Chan that some really, really wanted to believe. But, as the post above shows, they were also wrong regarding Uranium One.
But a few corrections to the claims, no, this isn't just 'a democrat couple and their cat'. The founders of Snopes (while it did start small) were registered Republicans, not Democrats. Since at least 2004, Snopes has been more than this couple, they now have a staff of about 20 people (last time I checked) and have a rather large internet forum.
One of the reasons they have leaned left is the left (DU types) joined the internet forum they have to submit articles and research and simply overwhelm the opinions. But there are Conservatives and Libertarians there too.
On balance, they are still one of the better sources to use, as long as you don't blindly follow them, use discernment and follow their citations to determine if their conclusion is legit.
As for what they are discussing here, the law in California, they seem to be more balanced than they are getting credit for. They are only reporting on the face value of the law, not making additional judgements as to how it can be used. One really can't ding them too much for keeping this at face value of what it says versus opinion of what it could turn into.