In 2008 and 2012, Obama relied more on small donors than his Republican opponents. One question is whether that will replicate itself in this election. (Clinton and/or the DNC could move to more tiered bundlers later on if she’s the (presumptive) general election nominee). How she starts now may change over time as she becomes less worried about being seen as big, impervious and presumptuous as a candidate.
I write a bit about the greater Democratic success with small donors after 2008 in:
The Transformation of the Campaign Financing Regime for U.S. Presidential Elections (in The Funding of Political Parties, Keith Ewing, Jacob Rowbottom, and Joo-Cheong Tham, eds., Routledge, 2011) and
The Changing Nature of Campaign Financing for Presidential Primary Candidates, in Evolution and Revolution in the Nominations Process (Jack Citrin and David Karol eds., 2009))