My current count is (which also includes DC at large) is Dem 52.6 GOP 45.7 or a gap of 6.9%. As more of CA comes it will most likely go to around 8%. But once I adjust (subjectively) for the fact the GOP had 37 seats without a candidate and Dems only 3 the de facto GCB gap will end up around 6.5%
How many of those 37 seats were really uncontested and how many were California top two Dem blowouts, though?
3 of the 37 are in CA where the GOP did not make it into the second round. Of course out of the 3 only 1 did the GOP even run a candidate in the first round. 1 additional one is on WA where the GOP did not make it into the second round. There the GOP did run a candidate in the first round but did not make it.
But the net affect is that had there been a GOP candidate in these 37 seats the GOP vote would be higher.