EXHIBIT A

JOINT FILING AGREEMENT

The undersigned hereby agree that the statement on Schedule 13G with respect to the Common Stock of Cullen Agricultural Holding Corp. dated as of July 5, 2011 is, and any amendments thereto (including amendments on Schedule 13D) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the previsions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

Date: July 5, 2011	MAGNETAR FINANCIAL LLC
	By:	Magnetar Capital Partners LP, its Sole Member
	By:	/s/ Alec N. Litowitz
	Name: Alec N. Litowitz
	Title: Manager of Supernova Management LLC, the General Partner of Magnetar Capital Partners LP
Date: July 5, 2011	MAGNETAR CAPITAL PARTNERS LP
	By:	/s/ Alec N. Litowitz
	Name: Alec N. Litowitz
	Title: Manager of Supernova Management LLC, the General Partner of Magnetar Capital Partners LP
Date: July 5, 2011	SUPERNOVA MANAGEMENT LLC
	By:	/s/ Alec N. Litowitz
	Name: Alec N. Litowitz
	Title: Manager
Date: July 5, 2011	/s/ Alec N. Litowitz
	Alec N. Litowitz