According to ThinkProgress:

The group behind the Nuns On A Bus tour that highlighted the ill-effects of the House Republican budget in congressional districts across the country is now setting its sights on the party’s presidential candidate, inviting Mitt Romney to spend a day with the nuns to learn about the plight of America’s poorest citizens.

NETWORK, a national Catholic social justice lobby, is inviting Romney to “spend a day with Catholic Sisters who work every day to meet the needs of struggling families in their communities,” according to a release. The group is specifically targeting Romney a day after his campaign released a misleading ad about welfare reform that Sister Simone Campbell, NETWORK’s executive director, said “demonize[s] families in poverty” and shows Romney’s “ignorance about the challenges” the poor face in America.

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