Much much much worse. On the other hand, it's not Republicans who are calling Pres. Obama a war criminal. It's the people on the far left. The left still calls Bush a war criminal who lied us into war even after 2 bipartisan commissions cleared him and his administration (see 3rd link above).
Lincoln was called a braying ass, an imbecile, disgusting in manner, a pettifogger, and worse in print. I suppose the yearning for a more civil discourse goes back as far as well, but the solutions used then were more on the order of burning down the newspaper offices and destroying the presses. There's no use in claiming that this side or the other started it.