Chris Cox does the appropriate thing

He really had no choice:

Securities and Exchange Commission Chairman Christopher Cox recused himself today from the agency's investigation of stock sales by Senate Majority Leader Bill Frist (R-Tenn.) to avert what he called "any appearance of impropriety."
Cox, a former California lawmaker who served for nearly a decade as a member of the House Republican leadership before joining the agency last month, cited personal connections to Frist in a prepared statement explaining his decision to step aside from deliberations about the probe.
Cox had donated $1,000 to Frist's reelection bid in 2000 through his own campaign fund, according to records compiled by the Federal Election Commission.