Good point. If the left wants to bring personal matters to the forefront of the general election, Newt need only remind them of Bill Clinton and BJ's in the Oval Office. He could remind them he has apologized for his personal indiscretions where Clinton never did - and was impeached - and lost his law license. Let the libs bring it, but I don't think they'll go there if Newt is the GOP candidate.
The lib focus will be on the whole "hopey changey" thing. The independents will be focused on who looks better and/or who TALKS the better game, as I stated above.
EG: Out in the real world, how many people will care about his PSA with Nancy Pelosi? None. But among the zombie faction here it is earth shaking.