\begin{table}[htbp] 
\centering 
\caption{\bf Within-Pool Comparisons: NP-Score of State Legislators Who Win Primary or General Elections vs. Others (Threshold to Define Pools = 50 Percent)} 
\label{tbl_main_regressions_win_prim_genl_50} 
\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 
\multicolumn{7}{l}{\textit{Primary Election Winners vs. Others in Pool}} \\ [0.01in] 
All pools              & -0.047 & (0.032) & [1955] & ~~0.106 & (0.027) & [2935] \\ [.01in] 
Safe districts         & -0.061 & (0.033) & [690] & ~~0.141 & (0.038) & [1660] \\ [.01in] 
Competitive districts  & -0.030 & (0.059) & [626] & ~~0.071 & (0.032) & [964] \\ [.01in] 
\midrule 
\multicolumn{7}{l}{\textit{General Election Winners vs. Others in Pool}} \\ [0.01in] 
All pools              & -0.049 & (0.032) & [908] & ~~0.123 & (0.040) & [1551] \\ [.01in] 
Safe districts         & -0.055 & (0.036) & [669] & ~~0.152 & (0.046) & [1160] \\ [.01in] 
Competitive districts  & -0.044 & (0.090) & [196] & ~~0.049 & (0.057) & [385] \\ [.01in] 
\bottomrule 
\end{tabular} 
\end{table} 
