Does anyone know what the "Center for Voter Information" is?

[Dionaea1]

4. Letter from them claims we didn't vote, but we did!

Both my husband and I received letters yesterday that claim "Recent Votes Missed: 2014 General Election" for me and "Recent Votes Missed: 2010 General Election 2014 General Election" for my husband. It goes on to claim "I am writing because, after checking the pubic voting records, it seems that you have missed recent elections."
We voted in all of those elections! And the fact that we did vote in those elections should be in the public voting records.
As a volunteer for the local Democratic Party working to help elect a new Governor and a new State Senator, I know the records show both of us did vote. I've also checked and doublechecked to be sure we're both still on the voting rolls. We did both vote in the recent local election (sheriff, etc.) and will be voting in the Mid-Term Election on the 6th.
So who is "Lionel Dripps", what is "The Center for Voter Information", and why are these misleading letters going out? Who are they sending these letters to? If the letters are inaccurate, what is the purpose?