JOINT FILING AGREEMENT

Exhibit 1

JOINT FILING AGREEMENT

     Pursuant to Rule 13d-1(k)(1) under the Securities and Exchange Act of 1934, each of the undersigned hereby agree that only one statement containing the information required by Schedule 13G need be filed with respect to the ownership by each of the undersigned of shares of stock of Vocus, Inc. This Agreement may be executed in any number of counterparts, each of which shall be deemed an original.

				Date: February 14, 2008
		LAZARD ALTERNATIVE INVESTMENTS LLC
				By:		LTP II LP, its General Partner
				By:		LTI II GenPar LLC, its General Partner
				By:		* Xxxxx Xxxxx, Managing Principal
		LAZARD TECHNOLOGY PARTNERS II LP
				By:		LTP II LP, its General Partner
				By:		LTI II GenPar LLC, its General Partner
				By:		* Xxxxx Xxxxx, Managing Principal
		LTP II LP
				By:		LTI II GenPar LLC, its General Partner
				By:		* Xxxxx Xxxxx, Managing Principal
		LTI II GENPAR LLC
				By:		* Xxxxx Xxxxx, Managing Principal
				*
				Xxxxx Xxxxx

Exhibit 1

						*
						Xxxxxxx X. Xxxxxxxxx
* By:		/s/ Xxxxx Xxxxx Xxxxx Xxxxx, in his individual
		capacity and as attorney-in-fact