  In a one dimensional electron gas at low enough density, the magnetic (spin)
exchange energy $J$ between neighboring electrons is exponentially suppressed
relative to the characteristic charge energy, the Fermi energy $E_F$. At
non-zero temperature $T$, the energy hierarchy $J \ll T \ll E_F$ can be
reached, and we refer to this as the spin incoherent Lutinger liquid state. We
discuss the Coulomb drag between two parallel quantum wires in the spin
incoherent regime, as well as the crossover to this state from the low
temperature regime by using a model of a fluctuating Wigner solid. As the
temperature increases from zero to above $J$ for a fixed electron density, the
$2k_F$ oscillations in the density-density correlations are lost. As a result,
the temperature dependence of the Coulomb drag is dramatically altered and
non-monotonic dependence may result. Drag between wires of equal and unequal
density are discussed, as well as the effects of weak disorder in the wires. We
speculate that weak disorder may play an important role in extracting
information about quantum wires in real drag experiments.
