You're in a great place right now: a great job at a top firm, and invaluable political experience. And you're still young.
This is just my personal opinion, but you may have dodged a bullet by not going to law school (that is, if you are not going to law school after all).
I don't know too many lawyers who are happy or satisfied. The work can be miserable, no matter what kind of law you practice.
And it really boils down to one thing:
More than any other profession, law is about seeing the glass half empty, whereas most professions are about seeing the glass as half full: in business, you are working on boosting sales and growing a company. In medicine, you are hoping to save a life (or to make someone better). In engineering, you're building something (not destroying it). Even in the military, you are fighting in order to bring peace.
But in law, your job is to identify and prevent problems. You're looking at the negative. You spend 3 years in law school learning how to think like a lawyer: so that in the real world you know how to do two things as a lawyer -- identify the legal issue in a situation, and find a legal solution to prevent the issue from blowing up. It's oriented toward damage control. You're looking to *protect* your clients - it's defensive. And that kind of negative angle can wear down just about anyone. More than any other profession, it brings out the worst in a person's cynicism and jadedness. Maybe only law enforcement or being a corrections officer is worse (and it's not like the quality of life for law enforcement officers is that great).
Corporate law (the most popular and highest paying) is so dull you'll die from a thousand paper cuts. It's drudgery and makes you hate life. Trademark/IP can be interesting, but the malpractice insurance you'd pay is so sky high and where your clients misuse litigation as a business strategy that you'd secretly wish the Chinese would pirate everything and cause your clients to go bankrupt. Estate/family law means you'll be dealing with divorces, custody battles, and rich kids fighting over their dead parent's money. Litigation requires an almost sociopathic streak (they probably have the most dismal view of human behavior of anyone).
Again as a client - you only hire a lawyer when you have a problem, or when you want to prevent a problem from happening.
Plus, the legal market is stagnant. Maybe even declining. The job market sucks for law, and will likely continue to suck.
My advice for you is to just focus on what you have now, and take it a step at a time. If b-school is in the cards for you in the future, then great. If not, no big deal because you already have a strong foundation for your career.
But don't go into law school unless you are ABSOLUTELY sure you want to practice law, and you know what you're getting yourself into. Again, the career satisfaction rates for lawyers are amongst the lowest of any white collar profession (at least in the US).
Damn, even talking about the law makes this whole post negative.