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We discuss magnetotransport in a low density electron gas coupled to spinfluctuations near and above a ferromagnetic transition. Provided the density islow enough ($n \lesssim 1/\xi^{3}(T)$, with $\xi(T)$ the ferromagneticcorrelation length), spin polarons form in an intermediate temperature regimeabove $T_c$. Both in the spin polaron regime, and in the itinerant regimenearer $T_c$, the magnetoresistance is large. We propose that this provides agood model for ``colossal'' magnetoresistance in the pyrochloreTl$_{2-x}$Sc$_x$Mn$_2$O$_7$, fundamentally different from the mechanism in theperovskite manganites such as La$_{1-x}$Sr$_x$MnO$_3$.Comment: 4 pages, LaTex, + 3 figure

Magnetoresistance in Mn Pyrochlore: Electrical Transport in a Low Carrier Density Ferromagnet