BUSH'S BRAIN "KARL ROVE" JUMPING SHIP ! ! !

This is truly the end of an era.

On board with Bush since the beginning of his political career in Texas, Rove was nicknamed "the architect" and "boy genius" by the president for designing the strategy that twice won him the White House. Critics call Rove "Bush's brain."

A criminal investigation put Rove under scrutiny for months during the investigation into the leak of a CIA operative's name but he was never charged with any crime. In a more recent controversy, Rove, citing executive privilege, has refused to testify before Congress about the firing of U.S. attorneys.

Since Democrats won control of Congress in November, some top administration officials have announced their resignations. Among those who have left are White House counselor Dan Bartlett, budget director Rob Portman, chief White House attorney Harriet Miers, political director Sara Taylor, deputy national security adviser J.D. Crouch and Meghan O'Sullivan, another deputy national security adviser who worked on Iraq. Defense Secretary Donald Rumsfeld was forced out immediately after the election as the unpopular war in Iraq dragged on.