 For Biden's own good and the good of the country, he should step aside immediately, says major Democratic donor and former hedge fund manager Whitney Tilson, telling DailyMail.com. This is, by the way, again, an exclusive on their site. The fact that it has now been three days and Biden has done nothing to reassure us confirms my worst fears. Tilson has given the Democrat Party more than $300,000 in recent years.