He’s being called the “most powerful man in Democratic Washington”, being the go-to guy for big labor under a President who couldn’t love big labor more if it was a progressive Brazilian President named Lula, yet Andy Stern, SEIU President, is resigning.

And no one is saying why. Or at least giving a believable reason.

So far, the only explanation being volleyed about is that the man has “grown tired of the daily grind,” with his daily grind consisting mainly of visiting the White House. At 59-years-old, Stern’s excuse falls flat after last week’s retirement of nearly 90-year-old Justice John Paul Stevens. What’s the real reason?

Supposedly, he’ll talk during next week’s SEIU Executive Committee Meeting about his retirement from the 2.2 million-member force of purple-shirts, a resignation coming while he’s in the middle of a strategic plan to punish House Democrats for voting against the health care reform monstrosity by forming a third-party initiative in North Carolina. Instead, sources are saying he wanted to “tackle different, more personal activities”, like…his golf game?

The Huffington Post reported he may not be leaving the office to a parade. Recently, SEIU won an embattled California lawsuit against the National Union of Healthcare Workers for trying to start a rival organization. The lawsuit, however, resulted in a $750,000 settlement but cost SEIU $10 million in legal expenditures, taken out of member dues. That’s an expensive argument.

Also, the institutional structures he used in establishing the labor coalition Change to Win have been reported as “less than sound“.

Or could it be guilt for the culture of corruption he established and what prompted an insurgent group – the SEIU Member Activists For Reform Today – back in 2008 to say:

So Stern’s message to us is clear – he cares more about expanding control for himself and an ever shrinking inner circle than he does about building real power for working people, creating solid organizations, coming through on SEIU’s political pledges for the fall, or even the perception of our union and our movement as real, democratic, valuable and clean. He will only act when there is no other option, and he will never apologize.

Despite his Washington power – logging more visits to the White House last year than anyone else, championing Craig Becker’s NLRB appointment, and being appointed to Obama’s new deficit commission – Andy Stern, SEIU President, is resigning. For now, speculation as to the “why” remains until a plausible reason is given or a scandal breaks.

Here’s a look at the SEIU’s finest. CONTENT WARNING