It’s an odd political tableau. Mitt Romney is on the verge of achieving something unprecedented for a non-incumbent Republican candidate: twin victories in Iowa and New Hampshire.

And yet the last few days of the Granite State campaign have raised, rather than allayed, concerns about the GOP frontrunner.

The last few days of the campaign found the Republican frontrunner on the defensive over the job-cutting side of Bain Capital — and committing unforced errors with an ill-timed, if innocently intended, comment about liking to fire people, a ham-handed attempt to strike a common chord, and an agitated exchange with a protester.