You see:
Since the trip's purpose was entirely and admittedly personal, the fact that he made campaign telephone calls and talked with staff aides while travelling does not convert this purely personal trip into a proper campaign expense. Therefore, the Obama Campaign violated the FEC's ban on "personal use" of campaign funds when it paid over $100,000 for the Campaign's charter to fly to Hawaii without obtaining reimbursement from Senator Obama.
After all:
Sympathy must not cloud the simple truth. This trip was personally important to Senator Obama, but served no campaign purpose. Its costs should have been paid with Senator Obama's own funds.
Nice one, guys.
At least it was only $100,000. [Insert Sarah Palin joke here.]