As do unanswered question I've posted on these issues.
I long ago read the link you provided, and the companion piece on Dodd.
Both billed as "Analysis", neither was. For Ensign, an endorsement, not entirely undeserved. For Dodd,

, while not entirely undeserved, either. But two very different treatments nonetheless, which turned me off, I admit.
Meanwhile, Ensign's bill is billed as sparing us DRE's and TouchScreens. What don't I get??? The bill says DRE's and TouchScreens need to produce paper. The paper is used IF you get a recount. There is no mandate for auditing. Again, no mandate for auditing.
Dodd, would allow a machine that, at voter option, would produce only an electronic record, though otherwise...a paper ballot. It's not great, but it's "voter option" that eliminates the paper. And it's that option that can enfranchise millions of voters. How many of these machines would be deployed?? (I'm interested in a 'modular' system that produces a paper ballot that can still be Voter-Verified regardless of disability, or at least, an auditing system that would dissuade hackers from targeting these machines.)
Holt/Conyers machines, also must print a paper ballot except as Dodd allows. And...it includes MANDATORY AUDITS. Plus, Holt deals with security issues, and as I read HAVA (thank you for pointing

), it includes the TABULATION. (I don't see that elsewhere, yet. Clinton, Graham, and Boxer's, 108th legislation, originally had some safeguards that got yanked in committee. A real "WTF was that about?".)
To be complete, there are the "proposed" timetables (with Ensign the most attractive in ambitiousness). But the realities of deploying equipment nation wide may suggest this too, a debatable point.
If I got bits of this wrong I'd welcome anyone that might disabuse me of incorrect notions. But, the standard-statement-sloganeering or and 'move along, nothing to see here'-like treatment, doesn't compel me...positively, anyhow.
While Ensign may be supreme with regard to best hope of passage, that claim is in addition to other claims about Ensign, Dodd, and Conyers, that I can't get to mesh with facts.