What was the temporary 1864 coalition of Republicans and War Democrats that backed Lincoln's re-election?

-UNION PARTY-

The coalition of 1864 between Republicans and War Democrats resulted in the running of a mixed ticket for the presidency in that year. Abraham Lincoln( a Republican) chose for his vice president Andrew Johnson (a Democrat from Tennessee). It was the first time since the Vice presidency of Aaron Burr that a vice president was from the opposition party from the President. It has not happened in American history since