Do you mean as a poll where users can vote on a response? If so, there's a poll plugin developed by @Schamper.
Just a question
I just want to know if a blog section and/or a forum section would be suitable for a website destined as a professional portfolio.
For example, a portfolio website maybe should never include a section about news or sports, as well as it should always include a section about the personal CV, but I don't know if a blog or a forum are ideal or convenient for the portfolio purpose.