I think that they support some things that the president has done to a certain degree but not everything. Why should they?

Supporting the good things such as insuring those who would not be otherwise insured should be commended but there are other factors.

1. Unnecessary violations of the Constitution. Ignoring "habeas corpus".
2. Invading countries not only with "unwinable" wars but immoral ones.
3. Kowtowing to oil companies who are despoiling US landscapes.
4. Going back on campaign promises.
(How do you know a politician is lying? His mouth is moving.)
5. Taking single-payer off the table.
6. Making nice with the GOP who is out to hurt him.

These are for-starters.

Of course, Romney (RoboCorp) would be worse.