Elizabeth Warren, back in Massachusetts after a stint in Washington getting the Consumer Financial Protection Bureau up and running, posted a diary at the state progressive blog Blue Mass Group today that comes close to saying, without expressing specifically, that she’s about to enter the Senate race against Scott Brown. Here’s an excerpt:

I left Washington, but I don’t plan to stop fighting for middle class families. I spent years working against special interests and have the battle scars to show it – and I have no intention of stopping now. It is time for me to think hard about what role I can play next to help rebuild a middle class that has been hacked at, chipped at, and pulled at for more than a generation—and that that is under greater strain every day.

In the weeks ahead, I want to hear from you about the challenges we face and how we get our economy growing again. I also want to hear your ideas about how we can fix what all of us – regardless of party – know is a badly broken political system. In Washington, I saw up close and personal how much influence special interests have over our law-making, and I saw just how hard it is for families to be heard. I want to hear your thoughts about how we can make sure that our voices –our families, our friends, and our neighbors — are heard again.

We have a lot of work to do in our commonwealth and our country. We need to rebuild our economy family by family and block by block. We need to create new jobs and to fix our broken housing market. We need to make sure that there is real accountability over Wall Street and that the greed and recklessness that created the last financial crisis do not create the next one. We need to restore the hope of a secure retirement and the promise of a good education. We need to stop measuring our economy by profits and executive compensation at our largest companies and start measuring it by how many families can stand securely in the middle class.

As one commenter at Blue Mass Group said, “This is a classic I’m-considering-running post.” And it’s true; it includes the hardscrabble biographical information as well as what I imagine would be the major themes of the campaign.

Warren remains on the fall teaching schedule at Harvard Law, but that could change quickly if she moves into a political campaign. And in addition to this post, according to The Hill she is being assisted by Doug Rubin and Kyle Sullivan, two high-level former campaign aides to Massachusetts Governor Deval Patrick. We already knew that Warren has held meetings with leaders of the Senate, as well as its campaign arm, the DSCC, and other Massachusetts politicians.

There was a lot of talk in the immediate aftermath of Warren leaving the Consumer Financial Protection Bureau about whether she would make the best use of her talents in a dysfunctional US Senate. My argument was that Warren is one of those unique figures in American public life – an actual competent human being. And any position she decides to take on, she will ultimately make the most of it.

That doesn’t mean she will definitely succeed. Scott Brown is well-liked in Massachusetts during his short time as a US Senator, and especially with Warren in the race, he’ll be able to draw from a mountain of corporate money, particularly from the banking sector. Warren can counteract some of that with her national profile and people power. If it materializes, it promises to be the most interesting race in 2012.