I'm an American living abroad and I'd like to register to vote. I'm trying to figure out in which state I can vote. I was born in Pennsylvania and lived there until the age of 21, then moved to Maryland for 4 years, then I was a graduate student in New Jersey for a little over a year, and then I moved abroad. So New Jersey was the last state in which I lived in the US, but I don't really consider myself a New Jerseyan; I have much stronger ties to Pennsylvania or even Maryland.
The website www.votefromabroad.com gives the following advice on the matter:
As U.S. citizen living abroad, your voting address is usually your last residence address in the U.S.-- but if you have new or strong ties to another state, you may be able to vote there. It is up to the Local Election Official (LEO) to determine whether to accept your voter registration application. You can explain your situation to your Local Election Official (contact information here) and ask what their decision would be, or you can try to submit the Federal Post Card Application (FPCA)–which you can produce here–and see if it is accepted.
So I took their advice, sent in my Federal Post Card Application in order to vote in Pennsylvania, and it was accepted, and I should be receiving some "balloting materials" in the mail. So does this mean it's legal for me to use these balloting materials to vote in Pennsylvania as long as I don't vote in any other state?