If an incumbent president is seeking another term in office who will his party likley nominate?

If an incumbent president is willing and qualified to run for reelection, his party does not contest his nomination, most likely because of the message that would be interpreted if the party does not support its incumbent president. However, that was not always the case. Before the Civil War, several incumbent presidents, including Franklin Pierce in 1856, sought but did not receive their parties' nominations for president.