  We present preliminary measurements of D to K^0_L pi and D to K^0_S pi
branching fractions using 281 pb^{-1} of psi(3770) data at the CLEO-c
experiment. We find that BF(D^0 to KS pi^0) is larger than BF(D^0 to KL pi^0),
with an asymmetry of R(D^0) = 0.122 +- 0.024 +- 0.030. For BF(D^+ to KS pi^+)
and BF(D^+ to KL pi^+), we observe no measureable difference; the asymmetry is
R(D^+) = 0.030 +- 0.023 +- 0.025. Under reasonable theoretical assumptions,
these measurements imply a value for the D^0 to K^+- pi^-+ strong phase that is
consistent with zero. The results presented in this document are preliminary.
