Actually, funnily enough, the Constellation program got it's big funding push under Bush, while he was talking about all his typical Republican things.
Then Obama showed up, cut Constellation and privatized the launch industry, to cries of socialism and communism.
Neither party is going to fund the previous party's space mission. A mission has to be too far along to cancel by the time administrations change or else it will get the ax.
If Apollo was still trying to put people in orbit in 1968, Nixon would have ended it to little public outcry.
Then Obama showed up, cut Constellation and privatized the launch industry, to cries of socialism and communism.