 because she is his VP and in essence he already has like set by naming her VP you're kind of naming someone as a successor and also just from a campaign finance perspective she's the only candidate who could come in and inherit his entire campaign war chest you know the president can direct his campaign to transfer some of the you know 90 million plus dollars that they have to the DNC but you know they also have to pay off debts they have to potentially offer refunds to donors they can't just give it to any other candidate who comes into the picture