>Yes you didn't declare it :-)
>The Dynamic SQL is executed in separate batch and any local variable declared in current batch is not visible there.
>You must use sp_executesql:
>

>DECLARE @voter_id INT
>SET @Command = 'SELECT @voter_id = voterid FROM tblCamp_CT WHERE VoterId = ' + CAST(@VoterId AS VARCHAR(20)) + ' AND ' + @Query
>
>EXEC sp_executesql @Command, N'@voter_id int OUTPUT', @voter_id = @voter_id OUTPUT
>

Ok, I tried this

DECLARE @voter_id INT
SET @Command = 'SELECT @voter_id = voterid FROM tblCamp_CT WHERE VoterId = ' + CAST(@VoterId AS VARCHAR(20)) + ' AND ' + @Query
EXEC sp_executesql @Command, N'@voter_id int OUTPUT', @voter_id = @voter_id OUTPUT
SELECT @voter_id

and I'm now getting

Procedure expects parameter '@statement' of type 'ntext/nchar/nvarchar'.

Not sure what @statement' is.