This issue became immensely more personal to me when I discovered that a few of my cousins are illegal immigrants. If only Obama had the balls to do this at the start of his presidency and not as a political ploy to win the support of more Latinos...
Actually, this may also lead to many people "coming out" - if you have to register w/ the government, anyway, no reason to keep it private. So, there could be quite a few people who'll find out that their cousins, friends, classmates, etc. are illegal migrants: it's going to bring this up close and personal across the board in many Hispanic (and other migrant) communities.
But, sure, it would have looked a lot better, if it were not happening after years and years of massive deportations by this administration.
Still, it makes it obvious what to do in your situation: if Obama wins, your cousins will have 4 years of safe life in the US. If he looses, they won't. You love your cousins? Then go out registering voters. Not for Obama's sake - who cares about him - but for their.