democrats dominating. unless republicans improve, the demography gives democrats the advantage. it's shifting country versus time for change. those are the big forces, the tailwind and headwind for democrats in twik. >> and close on 300 days to cover this. early yet. a lot of discussions ahead for all of those. ron brownstein, thank you very much, as always. >> thank you for having me. we've got more discussion coming up this hour. we've -- we'll look at some of the attack ads, hillary clinton has faced them since she made her big announcement. take a look. >> path will america take? a path to the past? a road to yesterday? to a place we've been to before? hillary clinton -- >> it all looks ominous, doesn't it? we'll have more on the republican reaction in 30 minutes from now. if you didn't see it and you want to catch the full video of hillary clinton's presidential announcement, it is a unique one. along all of our expert analysis. head over to cnn.com/politics.