Intelligent: I doubt it (there was a thread about IQs and a link to an online test - I scored a 93)
Politically left: Nope, slightly right
In his/her 30s: Yup, 31
Writer by profession: Nope
Gay: Nope
Underpaid: I’d like more money, but I would have to say that I am probably overpaid
The online tests aren’t too accurate.
Intelligent: Technically, yes, but I’m gladly humbled by the general population on this board.
Politically left of center (by U.S. standards): Yes
In his/her 30s Nope; 23.
A writer by profession: Not by profession, no.
Gay: No.
Underpaid: Yes.
Intelligent: I suppose so
Politically left: I suppose so
In his/her 30s: Just turned 30
Writer by profession: Depends on what your defintion of “profession” is. If you mean writing enough to support myself, then no. But if you mean writing as a nearly full-time hobby and making a painfully small amount of money at it then YES! 
Gay: No
Underpaid: See above answer to the writer question.
What Ringo said.
I’ve taken many an online test, IQ seems to be around 120-125, but you can’t really tell online.
No, I’m fairly conservative, with a couple left ideas as well.
Turned 20 6 months ago.
Not even close; working in IT and the gov’t right now.
No again.
Wouldn’t consider myself such.