Does a political organization need to identify contributions as being from federated campaigns, membership dues, fundraising events, related organizations or government grants on Form 990?

No, a political organization may report all of its contributions on the total line (1h of the 2010 Form 990) without breaking out federated campaign contributions, membership dues, fundraising events, contributions from related organizations and government grants.  It does need to identify contributions as cash or non-cash.

Additional information:

• Form 990, Return of Organization Exempt From Tax
• Form 990 instructions