\begin{table}[htbp] 
\centering 
\caption{\bf Within-Pool Comparisons: NP-Score of State Legislators Who Run vs. Those Who Do Not (Threshold to Define Pools = 25 Percent)} 
\label{tbl_main_regressions_run_25} 
\begin{tabular}{lcccccc} 
\toprule\toprule 
& \multicolumn{3}{c}{Democrats} & \multicolumn{3}{c}{~Republicans} \\ [.05in] 
Sample                 & Coeff.  & Std. Error  &  \# Obs.  & ~~Coeff.  &  Std. Error  &  \# Obs.  \\ [.01in] 
\midrule 
All pools              & -0.010 & (0.018) & [4294] & ~~0.090 & (0.021) & [6347] \\ [.01in] 
Open seats             & 0.013 & (0.020) & [2319] & ~~0.094 & (0.023) & [3200] \\ [.01in] 
Safe districts         & -0.022 & (0.022) & [1936] & ~~0.098 & (0.029) & [3552] \\ [.01in] 
Competitive districts  & 0.021 & (0.031) & [1275] & ~~0.102 & (0.037) & [2187] \\ [.01in] 
\bottomrule 
\end{tabular} 
\end{table} 
