POWER OF ATTORNEY



Robert D. McDermott





Know all by these presents, that the undersigned hereby constitutes

and appoints each of Jon W. Bilstrom, Nicole V. Gersch, Jessica M.

Pfeiffer, and Robert W. Spencer, Jr., signing singly, the

undersigned's true and lawful attorney-in-fact to:



(1) execute for and on behalf of the undersigned, in the

undersigned's capacity as an officer and/or director of Comerica

Incorporated (the "Company"), Forms 3, 4 and 5 in accordance with

Section 16(a) of the Securities Exchange Act of 1934 and the rules

thereunder;



(2) execute for and on behalf of the undersigned, in the

undersigned's capacity as an officer and/or director of the

Company, documents necessary to facilitate the filing of Forms

 3, 4 and 5;



(3) do and perform any and all acts for and on behalf of the

undersigned which may be necessary or desirable to complete and

execute any such Form 3, 4 or 5 and timely file such form with

the United States Securities and Exchange Commission and any stock

exchange or similar authority; and



(4) take any other action of any type whatsoever in connection

with the foregoing which, in the opinion of such attorney-in-fact,

may

be of benefit to, in the best interest of, or legally required by,

the undersigned, it being understood that the documents executed by

such attorney-in-fact on behalf of the undersigned pursuant to this

Power of Attorney shall be in such form and shall contain such terms

and conditions as such attorney-in-fact may approve in such

attorney-in-fact's discretion.



The undersigned hereby grants to each such attorney-in-fact full

power and authority to do and perform any and every act and thing

whatsoever requisite, necessary, or proper to be done in the exercise

of any of the rights and powers herein granted, as fully to all

intents and all purposes as the undersigned might or could do if

personally present, with full power of substitution or revocation,

hereby ratifying and confirming all that such attorney-in-fact, or

such attorney-in-fact's substitute or substitutes, shall lawfully

do or cause to be done by virtue of this power of attorney and

the rights and powers herein granted.  The undersigned acknowledges

that the foregoing attorneys-in-fact, in serving in such capacity

at the request of the undersigned, are not assuming, nor is the

Company assuming, any of the undersigned's responsibilities to

comply with Section 16 of the Securities Exchange Act of 1934.



The termination of any attorney-in-fact's employment by the Company,

however caused, shall operate as a termination of his or her powers

and authorities hereunder, but shall not affect the powers and

authorities herein granted to any other party.



This Power of Attorney shall remain in full force and effect

until the undersigned is no longer required to file Forms 3,

4 and 5 with respect to the undersigned's holdings of and

transactions in securities issued by the Company, unless

earlier revoked by the undersigned in a signed writing

delivered to the foregoing attorneys-in-fact at the then

current mailing address of the Corporate Legal Department

of Comerica Incorporated.



All Powers of Attorney previously granted in connection with

the foregoing matters hereby are canceled and revoked.



IN WITNESS WHEREOF, the undersigned has caused this Power of

Attorney to be executed and made effective as of this 10th

day of July, 2006.









/s/ Robert D. McDermott

Robert D. McDermott