This article in the Washington Post will set them straight:
Lawyers for Rep. Tom DeLay (R-Tex.) tried unsuccessfully in late September to head off felony criminal indictments against the then-majority leader on charges of violating Texas campaign law by signaling that DeLay might plead guilty to a misdemeanor, according to four sources familiar with the events...
The last-minute negotiations between the lawyers and Texas prosecutor Ronnie Earle were arranged after DeLay made what Earle considered a seriously damaging admission about his fundraising activities during an Aug. 17 meeting with the prosecutor in Austin.
At that session, DeLay acknowledged that in 2002 he was informed about and expressed his support for transfers of $190,000 in mostly corporate funds from his Texas political action committee to an arm of the Republican National Committee in Washington and then back to Texas, according to the sources, who spoke on the condition that they not be named.
Those transfers are at the heart of the prosecutor's investigation of the alleged use of corporate funds in the 2002 Texas elections, in violation of state law. In the prosecutor's view, DeLay's admission put him in the middle of a conspiracy not only to violate that law but also to launder money.
So DeLay essentially admitted to Earle that he was involved in the decision to launder money. This was why Earle could easily get another grand jury to get another indictment so quickly, and had to do more with negotiations breaking down than a grand jury unwilling to indict.