I had a Kos Diary entry that got over 800 replies titled "9 Ways Obama Didn't Fight". It is all about what went down over the Public Option. Debate on the page was hot and furious and I added many comments of my own in reply to those made by others. It's long, 11 paragragraphs. I don't want to divert this here thread into a detailed rehashing of those arguments now so I won't copy it all here. The arguments to an extent are interlocking, sort of like real life, so I can't just pull one thing from it for you and have it be the same. If you want to read it here is the link:
http://www.dailykos.com/story/2009/12/23/818333/-Nine-Ways-Obama-Didnt-Fight?showAll=yes&via=blog_736067I'll point out a problem with your framing though, it doesn't come into focus until a lot of water had already flowed under the bridge. Early in the process, had Obama fully engaged the public and directly mobilized his base to brand the Public Option in an optimal manner (Hint: Directly compare it to Medicare in every way possible) it was not so certain that no Republican would have backed it. Obama allowed the tea party types at staged town hall meeting invasions to define the Public Option in the public mind instead - making it much more difficult for a handful of more moderate republicans to possibly be associated with it. You simply can not start the discussion at the point in time you chose. Different choices effect strategic options.
I'll pull one example out of context for you though, only becasue I suspect it is the type strategy the Republican Party would have used - in fact they did use it. When Republicans grew frustrated with then minority Democrats in the Senate being able to fillibuster Judicial nominations they promised to use the "nuclear option" that would eliminate either parties ability to conduct fillibusters in the future. Many Democrats believed Republicans just might actually do it and became alarmed over the prospect. In the end a small unofficial bipartisan committee of Senators worked out a deal of sorts that took the nuclear threat off the table, and slowed down Democratic use of fillibusters.
Obviously had the nuclear option actually been evoked, Republicans would only have needed 51 votes to pass almost any legislation in the Senate. But simply threatening to do so got the job done for them instead. A compromise was reached. Flash forward to when Republicans were the Senate minority in 2009. The very last thing that Republicans wanted to lose in early 2009 was their ability to bottle up Obama's legislative agenda in the Senate. There was real potential leverage for Obama and Democrats in that. Especially if Obama had been pushing hard for a really robust public option all along, while allowing progressive Democrats make the case for single payer instead. A compromise that would have included a weak public option instead while agreeing to the nuclear option off the table in the Senate could have been the result.
Like I said, the essay is 9 ways Obama didn't fight. Check it out if you want.