The sad damn thing is that it is 'almost' required to have a lot of personal wealth and/or connections in order to seriously run for president. Harry Truman was an anomaly.

Gore was executor of his father's estate, and 'inherited' some Occidental stock, but never used it, and the shares were sold after the estate was settled.

Gore obviously has income from family sources, as well as speaking engagements. I've been following Gore for 15 years as he wrote about environmental issues, and I see that as totally separate from most of his income.