The group behind television commercials attacking Ontario's Conservatives is little more than a front for the governing Liberals, the Tory party president has alleged.

Blair McCreadie says he wants the Chief Electoral Officer of Ontario to investigate the Working Families Coalition for possible links to the Liberal party.

The group says it's running the ads to remind people that the Conservatives cut funding for social programs and downloaded services to municipalities before Mike Harris and his finance minister Ernie Eves were voted out of office four years ago.

The Conservatives claim the Liberals are violating Ontario's Election Act by having a third party buy television commercials to promote their re-election bid.

The coalition's expenditures should be listed as Liberal campaign expenses to prevent the party from getting around campaign spending limits, McCreadie said.

"The folks who created the advertising strategy for Working Families in 2003 were also providing the same types of strategic advice for the Ontario Liberal Party at the same time," McCreadie told CBC Radio on Friday. "So I think there's evidence that in fact those folks were acting as agents of the Liberal party when they ran those ads."

Both the Liberals and the coalition say there's no connection between the two organizations.