Why would a ticket with two Northern liberals (who supported civil rights and affirmative action) win Arkansas? Also, I think that Humphrey's MI margin was too large for Nixon to overcome, even without Wallace. Finally, I think Agnew would have delivered his home state of MD without Wallace running. What do you think the PV would have looked like?
Arkansas was very strongly Democratic at the time. Almost it's entire congressional delegation was Democratic.
Similarly, Spiro Agnew only barely won his election in Maryland (against a bad Democratic candidate) and had only been in office for a year or two.
As for Michigan, you may be right.
