There is an automatic voting tool by @marcgodard that you can use to do exactly this: https://steemvoter.com/

I use this site myself so can verify it works pretty well, though it does require some setup (it can't simply import all the names from your feed). It's currently under active development as well with new features coming soon.

Here's a link to the Steem Voter blog if you'd like to know more: https://steemit.com/steemit/@marcgodard/steemvoter-com-version-2-0