The Obama campaign is about to make its first big hire out of the campaign of Hillary Rodham Clinton. Patti Solis Doyle, who was Hillary Rodham Clinton's campaign manager until she was ousted in a staff shake up in February, will join Mr. Obama's campaign as the chief of staff to the vice presidential candidate - whoever he (or she) will be, campaign officials said.Ms. Doyle will take the position before Mr. Obama announces his choice for a running-mate - he has not said when that will be. Mrs. Clinton and Ms. Doyle have a long friendship, and Ms. Doyle has long been one of her closest aides, until she was forced out. Could that mean - tea-leaf reading time - that Mr. Obama is really considering Mrs. Clinton for the No. 2 position, and wants to have an ally of her in place to ease the way? Perhaps.Or perhaps not. More likely, the Obama campaign was looking for a high-profile spot to put Ms. Doyle, given her previous position, and most of the major roles in Mr. Obama's campaign are filled.Ms. Doyle's hire is the latest sign of the two fields in the Democratic Party attempting to come together. She is also - not incidentally - a Hispanic woman, making her a member of two demographics that Mr. Obama has been making a particular effort to appeal to.