Because his administrations track record over the last 3.5 years has been really good and they have made progress in a lot of areas. He has fucked up with Israel and he's old, but the experts that he's surrounded by that actually make the decisions will still be there if he wins. No President can just snap their fingers and make everything good, especially when the other parties goal is to obstruct and make counterprogress in everything. Quit reading headlines about his bumbled speech and look up the laundry lists of accomplishments from this admin.