Public Campaign Financing Act of 2003

Public Campaign Financing Act of 2003 - Amends the Federal Election Campaign Act of 1971 (FECA) to outline under a new title: (1) qualifications for public financing; (2) a prohibition against acceptance by qualifying House candidates of any contributions other than contributions from individuals that total not more than $100 per individual per election cycle, with an 80 percent in-State contribution requirement; (3) rules restricting public funding to specified purposes, such as buying broadcast time; (4) limitations on the maximum amount of public funding, which is set at $750,000 for qualifying House candidates; and (5) various specified requirements pertaining to television debates and radio and television advertising.

Authorizes the Federal Election Commission, in lieu of any report required to be filed by this Act, to allow a State committee of a political party to file with it a report required to be filed under State law if it determines such reports contain substantially the same information.

Prescribes reporting requirements about: (1) the election activity of persons other than political parties; and (2) contributions through intermediaries and conduits.