Why didn't all democrats support Harry Truman in 1948?

There were some Democrats who chose not to vote for Truman because they felt he was too liberal and not conservative enough.

Explanation:

These were mainly Southern Democrats. These Southern Democrats supported segregation and believed each state should have the right to determine its own policy on issues of race.

Democrats who chose not to vote for Truman because they felt he was too liberal and not conservative enough. (These were mainly Southern Democrats)