The density number will almost certainly increase. Both of the major US political parties are very pragmatic -- they're willing to shift their platforms as muc

The density number will almost certainly increase. Both of the major US political parties are very pragmatic -- they're willing to shift their platforms as much as necessary to capture a bare majority (if they weren't, they wouldn't remain major parties for long). So while it's possible that ideals currently endorsed by the Democratic platform will become more widespread that only means that the Republicans will shift their stand to match the majority opinions.