Should I contact a potential supervisor again?

[Polisci_2016]

Before I applied to grad school, I contacted a potential supervisor at U of A. They seemed really interested in my research and were super helpful in answering my questions about the program at U of A. 

Fast forward to now and I have been accepted into three other schools. However, I am really hoping to get into U of A. Should I contact this potential supervisor again inquiring about my application? If they know that I have been accepted into three other places, does this make my chances of getting into U of A better or worse? I have heard that if grad schools know that other grad schools want you, then they will try to give a more competitive offer later. Is this true? 

[ChrisTOEFert]

No, unless you have established a decent rapport with them.  It is never their decision, they have to champion you to the department, the department has to be reasonably unanimous in their selection, and then the graduate office has to finally approve all offers.  I would bypass the POI and send a concise email to the grad coordinator in the department and let them know you have a couple of offers pending and you wanted to know your status so you could make an informed decision about where you want to go.  This will not positively or negatively impact your application unless you're rude, email them every day, or become hostile if they don't respond immediately.