How can President Bush justify spending taxpayer's money (flying
military aircraft, ie. Air Force one and Marine One) for fund raising
for his campaign.  Is this legal?

Yes, it is legal, according to accounting guidelines established in
1982, as long as some kind of official event is involved.  Here is an
excerpt from the article addressing your question.  You can find the
entire article at the following link:

"Stopovers Let Bush Charge Taxpayers for Political Trips" by Mike
Allen, The Washington Post, May 20, 2002 obtained from
http://www.commondreams.org/headlines02/0520-01.htm.

"During a February trip to New York, where he raised $2 million at a
pair of reelection receptions for Gov. George E. Pataki (R), President
Bush stopped by the New York Police Department's command-and-control
center for a brief tour and to give a 21-minute speech.

That side trip added a patina of government officialdom to the day. It
also allowed the White House to bill taxpayers for 54 percent of the
hotel rooms, rental cars and other local expenses for setting up the
visit.

And because Bush is always the president -- whether acting as
commander in chief or head of the Republican Party -- taxpayers pay
the full $57,000-an-hour cost of flying Air Force One regardless of
the trip's purpose. The government also pays for most of his entourage
and for the military and communications gear and evacuation
helicopters that travel ahead of him.

For trips that include fundraising, other costs -- including lighting,
rental of a hall, cars and hotel rooms for advance workers -- are
apportioned according to how much of the trip was political and how
much was official government business. The effect is a deep taxpayer
subsidy of presidential political trips, because the parties or
candidates pay far less for the total visit than does the government.
New York Republicans had to reimburse the government just $5,912 for
Bush's politically focused visit in February, while the government
paid many times that amount.

The accounting guidelines used by the White House were set in 1982,
and Democrats benefited mightily from them during President Bill
Clinton's marathon fundraising swings. Now it's the GOP's turn."

I hope the above provided you with the information you were seeking.

Sincerely,

Wonko

Thankyou for the expediant answer.