"Aliyah" references immigration to Israel—so, in other words, the bumper sticker is exhorting Jews to leave America because Obama could win.
Though certainly that could merely be referring to, say, his economic policies, it is more likely a response to the belief, just as firm among one segment of the Jewish community as one segment of the Christian community, that Obama is a secret Muslim. (See here for an example; see here for Obama responding to the rumors in a speech to AIPAC.)
Oy gevalt.
[Obama Racism/Muslim/Unpatriotic/Scary Black Dude Watch: Parts One, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Eleven, Twelve, Thirteen, Fourteen, Fifteen, Sixteen, Seventeen, Eighteen, Nineteen, Twenty, Twenty-One, Twenty-Two, Twenty-Three, Twenty-Four, Twenty-Five, Twenty-Six, Twenty-Seven, Twenty-Eight, Twenty-Nine, Thirty, Thirty-One, Thirty-Two, Thirty-Three, Thirty-Four, Thirty-Five, Thirty-Six, Thirty-Seven, Thirty-Eight, Thirty-Nine, Forty, Forty-One, Forty-Two, Forty-Three, Forty-Four, Forty-Five, Forty-Six, Forty-Seven, Forty-Eight, Forty-Nine, Fifty, Fifty-One, Fifty-Two, Fifty-Three, Fifty-Four, Fifty-Five, Fifty-Six, Fifty-Seven, Fifty-Eight.]
