Robbio a sleeper candidate in CD2?

An alert reader of On Politics pointed out something we haven’t seen reported elsewhere: an obscure Republican, Donald Robbio, outpaced the GOP’s endorsed CD2 candidate, Mark Zaccaria, as well as self-styled outsider, Bill Clegg, in last week’s Brown poll:

[From 65 likely Republican voters in the 2nd Congressional District] If the Republican primary for the 2nd Congressional District were held today, would you vote for: 7.7% William Clegg; 4.6% Michael Gardiner; 12.3% Donald Robbio; 9.2% Mark Zaccaria;

A whopping 66 percent of those surveyed were undecided or didn’t know who they’d be voting for.