"We understand that we may not win these voters back entirely, but if we don't make inroads into these areas, we will win the popular vote, lose the Electoral College, and the Senate could be lost for a decade", American Bridge's memo to donors, obtained by the broadcaster, said.
The funding will be used for an advertising campaign focusing on the states of Wisconsin, Michigan, Pennsylvania and, possibly, Florida, in an attempt to persuade voters that Trump's policies have harmed their interests.
The organisation aims to raise funds to boost its biannual budget from $30 million to $80 million for the 2020 presidential campaign, the broadcaster said.
According to Democratic strategist James Carville, who works with American Bridge, Midwest states have been underinvested by the party, and "writing off" rural white people is "immoral" and "politically stupid".
Michigan, Pennsylvania and Wisconsin are the states where Trump outpaced Clinton in the 2016 election by the narrowest margins of less than 1 percent in each and were vital to securing the victory of the Republican candidate. Florida had the fourth smallest margin in favour of Trump in the 2016 election — 1.2 percent.