So who wants to fund a highly unpopular politician’s sexual harassment settlement on behalf of a disgraced political worker under federal investigation? Executives at Illinois’ largest public-sector labor unions.

Anti-Rauner PAC got nearly 90 percent of its funding from government-employee unions

In the race for Illinois governor, campaign contribution restrictions have legally been lifted. Labor union’s political action committees, or PACs, have long been primary financial backers of Democrats both in Illinois and nationally. Unsurprisingly, these PACs are now throwing extraordinary amounts of cash behind Gov. Pat Quinn’s re-election bid. Quinn’s political war chest is closing...