O'Malley presented his list to the state's Congressional delegation, which is predominantly Democrats, like himself.
Sen. Ben Cardin said funding for mass transit could be held up by some Republicans in his chamber who are looking to put more money to roads.
"We can't build enough roads. But transit actually saves us road money. So that we can keep our roads in better condition," Cardin says.
O'Malley also feels putting more money into roads, rather than transit, is the wrong move.
"It saves us road money. It also saves in terms of the wear and tear on the climate. It saves in terms in the amount of land," he says.
O'Malley also urged lawmakers to fight steep spending cuts to federal agencies located in Maryland, such as the National Institutes of Health in Bethesda.