Billionaires George and Alex Soros are throwing their support — and likely millions in campaign donations — behind Kamala Harris in her bid for the presidency. In the 24 hours since President Joe Biden dropped out of the race amid increasing concerns over his health and age, Democrats have rallied around Harris as the most viable candidate next in the line for the party nomination. Among her supporters is 93-year-old Democratic megadonor George Soros, who confirmed his backing of Harris to The Wall Street Journal on Sunday. Soros made his fortune managing hedge funds and is a prolific philanth…