If anyone could blow a surefire win, it would be Hillary. However, Trump is mainly just getting a temporary bounce from the fact that the GOP primary ended before the Dem primary.
Where does this meme even come from? Hillary won a Senate race as a carpetbagger and almost beat
Barack Obama of all people in 2008 and was able to secure the nomination in 2016 despite a huge anti-establishment sentiment in America.
Even if you could argue that she's a bad candidate somehow, there's obviously plenty who have been way worse. How about Martha Coakley blowing a race in
Massachusetts twice. Or Bruce Braley, Denny Rehberg, Rick Berg, Jeb Bush, etc.