In the Washington Post today, Harold Meyerson — who knows whereof he speaks on these matters — addresses the worries of Democrats who fear that John McCain will sail smoothly forward while Hillary Clinton and Barack Obama duke it out:

[W]ho will be broadcasting a critical look at McCain’s record while Clinton and Obama duke it out? The Democrats’ biggest donors — unions from both sides of the candidate divide and business executives who funded the independent expenditure campaigns of 2004 — will have to assume this task in the absence of a presumptive nominee.