Allies of Sen. John McCain have found new loopholes in the campaign-finance law he helped write -- and they're using them to reel in huge contributions to help him compete with Sen. Barack Obama.

In one method, a Republican Party fund aimed at electing governors has started marketing itself as a home for contributions of unlimited size to help Sen. McCain. His 2002 campaign law limits donations to presidential races to try to curtail the influence of wealth.

The...