I don’t know about her feelings towards Romney, but I have felt that Bachmann’s goal for some time now has been the Veep spot.
Coming from the House, Bachmann’s odds were historically long to begin with. Outside of Gerald Ford’s appointment and subsequent promotion, you’d have to go back pretty darn far to find a President or a Presidential nominee who came straight from the lower chamber instead of using it as a stepping stone to Presidential fast-track positions like the Senate or a Governorship.
Add in some of the unfortunate statements she made and more recent funding and organization woes, and I think she came to the realization her best remaining option was to stay in the race and draw enough support to warrant consideration for the #2 slot on the ticket with whomever becomes the eventual nominee.
Nothing wrong with any of that, of course. In fact, I’d wager every candidate in the race (except maybe Romney) has had Veep as a backup plan. I just think that in Bachmann’s case, it’s become the default option.
Ford was Minority Leader of the House, so that trumps Bachmann by a mile.