I think depending on whatever the time period is (the sliding timescale is in play here) Peter and his family have traditionally voted towards more liberal points of view. There's several issues of the Conway Amazing/Spec run of Peter sympathizing with inner city groups about gentrification of their neighborhoods, the Lee/Romita run where he sympathizes with on-campus protestors but chooses not to get involved in favor of playing Spider-Man, and an issue of... I wanna say during the Mackie/Byrne reboot where Peter, MJ and May talk about how awful George W. Bush was during the 2000 elections. It just depends on how we look back on each era, because there was always the political radicals in comics. But I've always seen Peter as a traditionally liberal person.

Most super heroes are liberal because most writers are liberal.

Peter Parker is a New Yorker who moves in academia/newsmedia and the gig economy...so that would put him left-of-center. This is a city that was overwhelmingly blue and anti-Trump.

Historically, in the 70s and so on, Peter was shown to be apolitical but someone who was quite anti-authoritarian. Like in #91-92, Spider-Man and Peter combat Sam Bullitt, an authoritarian DA candidate who is shown to have ties to hate groups, and is racist to Robbie Robertson, and both Peter and Robbie invoke Godwin's Law. On the other hand at the time Peter is dating Gwen, who works as a volunteer for Bullitt an openly backs his "law and order" campaign, and basically is the early version of the Blonde Republican Sex Kitten.

"Well, because Liberals in today's society are nothing, but Far-Left Leaning, Politically Correct, Whiny and Irritating Lunatics, who have nothing better to do with their lives, but constantly turning everything Popular into garbage, by injecting SJW and Feminist propaganda into it and annoy/harass other people who don't agree with them on certain topics."

shrugs

not this liberal

@glaucus: Well, there are some actually good liberals out there, like Dave Rubin is a good example, because Classical Liberals (which he is), are much more mature, well manared people than Modern Day Liberals, because they represent the traditional meaning of Liberalism which is well, Liberty not authoritarianism which is what Liberalism has become in the US, if you don't agree with the Left, than your automatically labeled a Nazi, a Racist, a Homophobe, a Mysogonist, a Far-Righter, a KKK Member and so on and so on. And I've been labeled these by many people who strongly disagree with my political beliefs (which are Conservative) and I even once got, well almost got into a physical fight with an SJW who was so triggered, when I disputed all of his statements on Racism, Feminism and Abortion. He then tried to fist fight me and really I wanted to avoid it, because I felt sorry for the guy I mean like he was only 5'8 and about 145 - 150 lbs, while I'm 6'2 and over 280 lbs and I actually have some experience in boxing while the other guy probably has none. So, because I didn't want him to end up embarrassing himself in front of a crowd of people and probably get a black eye and a broken nose, I just left and ignored all of his taunts to try and provoke me. And just to be clear, not all Liberals are like this, but a good majority of them are, there are some good Liberals and one of my classmates from High School, was a gay liberal but despite are differences in politics we still treated each other respectfully and politely, like rational, civilised human beings.