Exhibit 32.1

CERTIFICATIONS OF

CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Vocus, Inc. (the “ Company”) for the quarter ended September 30, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “ Report”), Richard Rudman, Chief Executive Officer, President and Chairman of the Company and Stephen Vintz, Chief Financial Officer, Treasurer and Secretary of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to our best knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 8, 2011

        By: /s/ Richard Rudman

                Richard Rudman

                Chief Executive Officer, President and Chairman

        By: /s/ Stephen Vintz

                Stephen Vintz

                Executive Vice President and Chief Financial Officer