Logic problems

Before the election, three friends, Ann, Brian et Clint, are talking about it  :
Ann : « If Brian votes for Ryan, I won't vote for Stefan. But if Clint votes for Stefan, I will vote for Zach. »
Brian : « If Ann votes for Zach, I won't vote for Stefan. But if Clint votes for Ryan, Ii will vote for Stefan. »
Clint : « If Ann votes for Stefan or for Ryan, I won't vote for Zach. »

The day of the election, they vote all three differently. Who votes for whom?