Wonder what the D's and R's bare minimum win is now.
I presume that D's is Kerry + OH + NM/IA.
R's not so sure.
Numerically, you're correct on Kerry +OH+IA and Kerry IA+VA+NM works for exactly 270 for the D's. Kerry +OH+NM is a tie. Getting exactly 270 for the R's is more challenging and most plausible scenario I found was Bush 2004 +PA-FL-VA
The closest possible wins going off of 2008 margins are Kerry +NV+CO+IA+NM for a 272-266 D win and flip CO for a 275-263 R win with Bush 2004 -NM-NV-IA.
Does the lame duck House or the new House elect the new president if there is an EC tie?