* Story Highlights
* Clinton insiders say she will indicate support for Obama
* Obama expected to clinch nomination this week
* Democrats face struggle to unite party after divisive campaign
(CNN) -- The titanic struggle for the Democratic candidacy neared its end Tuesday with final voting expected to push Hillary Clinton aside and usher in Barack Obama as the first ever black U.S. presidential nomination for a major political party.
Obama needs the support of about 40 more Democratic delegates to make the 2,118 needed to capture the nomination at the party's August convention but he is likely to depend on superdelegates -- party officials free to back any candidate -- to tip the balance.
The Illinois senator, who has sought to dispel fears of inexperience by campaigning on a message of change, has emerged as favorite in recent weeks despite a dogged campaign by Clinton who as former first lady claims to have more political experience.