On the surface that could look like a foolish policy.But consider just one state,my state,Massachusetts.Our state legislature,both House and Senate,are 95% Rat and have been for years.Over the years they've gotten our Congressional District map set up in such a way that nobody but the filthiest Maoist Rat could win.It would be as foolish for the GOP to spend a nickel on any of the Gay State's 9 Congressional districts as it would be to spend money in Bella Pelosi's district.
And our 9 districts can't be the only lost causes in the country.
It's surprising that 39 Democrat seats and only 3 Republican seats are uncontested. That's what you might have expected back in the days of the "Solid South."
One reason may be the new law in California and Washington State saying that the top two candidates coming out of the primary are on the ballot for the general election -- even if they are of the same party -- but most of those districts are probably urban and minority.