Sorry 'bout that--I can get the Figures of Fury typing thing going.
No problem on not being a lawyer--they don't make any legal decisions anyway so it really doesn't matter. Plus, no one likes them.
As for the Constitution being vague--it sounds pretty clear in the case you quoted. The states can't take away your voting rights on the account of age. Period. But, this doesn't address the issues at hand: felons, dishonorably discharged people (I didn't know they couldn't vote?), and the proposed group--welfare recipients. So finding the spot that says that the gov't can take away a person's right to vote for whatever reason would be helpful.
If anyone knows where this might be written, it would be interesting to read...