They can designate all they like. The problem, just like how the DHS handles airport security, border security, and every other kind of security that comes under their purview is that they will not have the capability / talent to figure out the problems, create a solution, and propagate it against political stupidity that a real fix requires.
The model of government today in the US is to outsource every bit of work that needs to be done to contractors who have to get their margins and aren't interested in sharing their technology/code, making it smart, scalable, and maintainable, and who want to maintain profits into the future. And this is why we have voting machines designed by Diebold, airport scanners (and TSA staffing) that's designed and run by the lowest common denominator, and an electric grid that isn't robust against anything (though this also falls in the lap/blame of NERC/FERC/and 50 different state regulators).
Take the choice of election technology, ballot design, and security out of the hands of 5,000 different jurisdictions, and replace it with well-designed, thought-out, and implemented hardware+software that a dedicated, concerned group of experts is responsible for -- that's what this would take. And is impossible.