If Johnson is a serious candidate, 48%-49%.
If Johnson gets less than 1% again, 52%-53%.
Democrats have a pretty high floor, they've won the PV 5 out of 6 times as everyone knows.
And it's only getting higher. I think at this point, it's pretty widely known, which isn't great news for Republicans if their most realistic and ambitious win scenarios always end up involving a bare win of between 270 - 290 electoral votes. They've fallen quite far from their days of constant 400+ EV landslides.
After this whole Trump business, I wonder just how long it's going to take them to finally begin adapting to a highly diverse & rapidly changing electorate. They are going to be in serious trouble if they continue losing the 18-29 yr old vote by such gaping margins.