http://voteforbernie.org/
"New York
New York has closed primaries.
New Yorkers must register as democrat to vote for Bernie!
How to vote in New York»
Online Registration Available!
Important! If you registered to vote online in the last 6 weeks, your registration may not be processed in time! Check your registration here, and if you are still unregistered, submit a new registration by March 25th, 2016.
New voters only: The deadline to register as a Democrat is March 25th. If you are currently registered to vote in New York and are not registered as a democrat, you will not be able to vote for Bernie.
Pennsylvania
Pennsylvania has closed primaries.
Pennsylvanians must register as democrat to vote for Bernie!
How to vote in Pennsylvania»
Online Registration Available
Register By
Mon, March 28 (4 more days!)
Wisconsin
Wisconsin has open primaries.
Wisconsinites can vote for Bernie Sanders regardless of their registered party
How to vote in Wisconsin»
Note: Wisconsin allows registration at the polling place with proof of at least 28 days residency."