Democratic lawmakers in a handful of states are facing pressure from Republicans to distance themselves from the Service Employees International Union as a result of its ties to ACORN.

Republicans in Kansas, Virginia and Illinois in recent weeks have called on union-backed Democrats to return SEIU campaign contributions, citing the close connection between the union and the community organizing group, whose full name is the Association of Community Organizations for Reform Now.

ACORN has been under fire in the past month after secretly recorded videos showed ACORN employees offering advice on evading taxes, setting up brothels and smuggling illegal immigrants...