Republican presidential hopefuls Michele Bachmann and Rick Perry are tying rivals Mitt Romney and Newt Gingrich together and calling them not conservative.
Bachmann referred repeatedly to "Newt-Romney," saying Gingrich and Romney hold similar views on health care, illegal immigration, cap-and-trade legislation and the payroll tax cut extension.
Perry said he agrees with Bachmann. He attacked Romney for including an individual mandate in the insurance plan he signed as governor of Massachusetts.
Bachmann says if voters want a "proven conservative, it's not Newt-Romney."
The Republican hopefuls are debating at Drake University in Des Moines.