The primary moneyed democrat supporter would have to be Warren Buffett who owns/controls a lot of the rail shipping support.
Perhaps this was why Berkshire Hathaway bought BNSF Railroad in 2009? Buffett knew that President Obama was not exactly in support of the Keystone XL pipeline, but the BNSF Railroad could easily ship oil out of the Bakken oil fields since BNSF has an extensive railrroad infrastructure in the Dakotas.