A giant Orange County mortgage company accused of duping low-income homeowners has pumped more than $7 million into California politics since 2002, including contributions to Republican Gov. Arnold Schwarzenegger, Democratic Attorney General Bill Lockyer and dozens of other state legislators, members of Congress and political committees. Ameriquest's top executive, Roland Arnall, also has been one of President Bush's top fundraisers, generating $12 million for the president's political efforts during the past four years. On July 28, Bush nominated Arnall, a billionaire who was ranked No. 106 in the 2004 Forbes magazine list of the wealthiest Americans, as ambassador to the...