Only if they manage to deny Trump the nomination.
I see no scenario where Hillary loses. If Trump wins the nomination the establishment pubs stay home or if a GOPe type wins then conservatives stay home. In any of these scenarios including 3rd Party Trump the opposition to the dems is yugely divided - more so than in the past. Add to that MSM control, dem dirty tricks, illegals voting and 1st woman President buzz, etc and Hillary has a huge advantage. I am not sure any of this can be helped because there are honest overdue differences that have to be sorted out at the ballot box. So let the chips fall where they may and we shall see what happens.