Shouldn’t Democrats insist that Sen. Durbin step down as their whip, the number two man in their leadership?
Meaning of the quote
This quote is asking why Democrats aren't demanding that Senator Durbin, who is their second-highest leader, step down from his position. The person who said this, Bill Kristol, seems to think the Democrats should take this action, but he doesn't explain why. Without more context, it's hard to understand the full meaning behind this quote.

About Bill Kristol
Bill Kristol is an American neoconservative writer who has been a frequent commentator on TV networks. He founded the political magazine The Weekly Standard and currently hosts an interview web program. Kristol has been associated with various conservative think tanks and has played a leading role in shaping US foreign policy and politics.
More quotes from Bill Kristol
Surely our inaction with respect to Syria is a poor precedent if we’re fighting a war on terror.
American writer
These soldiers deserve a better defense secretary than the one we have.
American writer
If the American people really come to a settled belief that Bush lied us into war, his presidency will be over.
American writer
Shouldn’t Democrats insist that Sen. Durbin step down as their whip, the number two man in their leadership?
American writer
Bush is no conservative.
American writer
All defense secretaries in wartime have, needless to say, made misjudgments.
American writer
In any case, decisions on troop levels in the American system of government are not made by any general or set of generals but by the civilian leadership of the war effort.
American writer