Chart taken from Investopedia’s article on K-shaped Recovery; but the underlying principle is the same: Some parts of the economy are performing so well that it masks the other sectors which are struggling.
i.e. the rich are getting so much wealthier, that when looking at the overall average the number is trending positively and not showing that the rest of society is getting poorer. This is one of the reasons when using aggregate measures, the median value is significantly more valuable than the average.
In general yes; but Romney is probably one of only a handful of GOP politicians who could work with the Dems and not get primaried out.