First question is tough. It would be a split between Lincoln and Washington...but I'd go with Washington. As for the second, I think we need a Lincoln now. The thing that stands out to me is Lincoln's 2nd inaugural address.
After prosecuting the Civil war, there were calls by the north for severe retribution for the cost of the war. Lincoln took another approach. Despite all the pain he knew the path to healing was not by inflicting more pain.
As evidenced by this quote from that address, "With malice toward none, with charity for all, with firmness in the right as God gives us to see the right, let us strive on to finish the work we are in; to bind up the nation's wounds; to care for him who shall have borne the battle, and for his widow and his orphan - to do all which may achieve and cherish a just and lasting peace, among ourselves, and with all nations."
I think we need another Lincoln because I see a divide in this country that needs to be closed.