How desperate is Jeb Bush? He's thinking about campaigning with his brother.

Jeb Bush is polling at 4 percent among Republican voters, according to the latest survey from Pew. While his handlers say that the campaign is built for the long haul, and political scientists will tell you that the laws of political gravity will ultimately drag down renegade candidates like Donald Trump, we've also seen how low poll numbers sparked a death spiral in dried-up funds and plummeting enthusiasm for the likes of Scott Walker and Rick Perry.

So a rattled Bush campaign is reportedly contemplating bringing out a big gun to woo disaffected conservative voters: George W. Bush, who is still popular with the party's base, even as he remains a divisive figure with the voting public at large. The New York Times reports that the decision to campaign with the former president is "an agonizing one for the campaign":

While dispatching George Bush to a state like South Carolina could shore up his brother's standing with conservatives, and remind voters there of a political family they still admire, it could also underscore the impression that Jeb Bush is simply a legacy candidate at a time when voters are itching for change.What is more, given the former president's unpopularity among many in the broader electorate, joint appearances by the brothers could provide irresistible footage for Democratic attacks against Jeb Bush if he wins the Republican nomination. The continued instability in the Middle East, in particular, could remind voters of George Bush's decision to invade Iraq and make joint images of the Bush brothers potent fodder for the opposition. [The New York Times]

Then again, if Jeb Bush were to cling more tightly to his brother, he couldn't do worse than his competitors, who for the most part have embraced George W. Bush's legacy on issues of national security and taxes. Appearing with the former president on stage would just make the connection explicit.