What if Hannibal Hamlin was President of the United States from 1865-1877?

Vice President Hamlin is Kept on the ticket from the 1864 election and Linconl likely still won in a landslide like in OTL but just lost New York. But Hamlin became president after his assassination.

For 1868, President Hamlin, with Speaker of the House Schuyler Colfax as his running mate, defeated Horatio Seymour in a landslide, for 1972 his new running mate was Ohio Governor Rutherford B Hayes (John Sherman could be another option).

What would Hamlin's presidency would look like?

How different would the reconstruction have been?

Would the liberal Republican split still happen in 1872, if not who would have been the dem nominee?

Would Ulysses S. Grant, still become president in 1876?