It is true that victories for the Dems in 2016 are rough just because of the shear length of incumbency at that point. It would be the first time Democrats won three in a row since FDR. The first time anyone's done it since Bush Sr. So, it's almost inherently stacked against them at the presidential level. However, it's make or break for Republicans. If it somehow did turn out that Hillary wins, Democrats maintain the senate, and take control of the house, I think the Republican party as we know it will cease to exist. So, they have give this their all.