So...Obama in 2008 eschewed the public campaign financing so that he could get more from large donors. Which he did. Like I said earlier when I talked about PHARMA and HIPPA influencing Obamacare...that's why we didn't get a Public Option or single payer.
Also, apart from Obama, Sanders, Warren, and maybe AOC, no politician is going to pull those kinds of numbers from small donors.
He didn't take the public financing because he could raise and spend much more if he didn't--it didn't matter whether all that additional money came from large or small donors. By 2006 Obama no longer favored single payer.