Yes, Aquarius are the most "left wing" of the zodiac, but they can be radically conservative or libertarian (think CA governor/US president Ronald Reagan, born Feb 6 1911 - died 2004). I find Taurus not as farther left, because they want to "stay on point" and they have a hard time with politics, either they try to not care, ignore it, avoidance of discussions or eschew the process.
My Taurus mom (born Apr 29, 1951- Aquarius moon) is center-left, except she grew up in the 1950s, attended a "southern" Baptist church, her father served in the US Marines in WWII and Korea, worked for law enforcement (dispatcher and matron), and made sure her two sons never dropped out of school and got a job as adults, these are typically social conservative traits.
I believe what made her a Democrat after previously being Republican (the 1970s) is 1. her gender (she found conservative male politicians unsupported of women's rights), 2. racial origin (her father is a Cherokee/Osage Indian, but passed as "white" since he is also Scottish from Oklahoma), 3. income level (not rich or above upper-middle class), 4. she became physically ill or disabled, and 5. she divorced and never remarried for the last 30 years. She felt alienated by the GOP...since the Reagan era, so she became a Democrat.