Rick Santorum has shrugged off Mitt Romney’s victories in the Maine caucuses and the straw poll of conservative activists that preceded it, describing the Republican nomination race’s frontrunner as “desperate.”

Santorum said he could do “exceptionally well” in Michigan, where Romney grew up and where his father served as governor and expects to be in a “two-man race” with him.

The next contests take place in Michigan and Arizona on 28 February