Read the 14th amendment. The President doesn't have the power to allow someone like Kerry to serve in public office through a pardon.
Amendment 14..............................
3. No person shall be a Senator or Representative in Congress, or elector of President and Vice-President, or hold any office, civil or military, under the United States, or under any State, who, having previously taken an oath, as a member of Congress, or as an officer of the United States, or as a member of any State legislature, or as an executive or judicial officer of any State, to support the Constitution of the United States, shall have engaged in insurrection or rebellion against the same, or given aid or comfort to the enemies thereof. But Congress may by a vote of two-thirds of each House, remove such disability.
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If true it would be fitting to see him removed, stripped of benefits and retirement pensions and his record made to reflect his fraud.
And who is to say that congess did not?
I do not have the time dig through millions of pages of U.S.C. to find out whether or not they did.
Also, if now one knows of the disability, does it exist?